DEPARTMENT OF LICENSING AND REGULATORY AFFAIRS

DIRECTOR'S OFFICE

CONSTRUCTION CODE

(By authority conferred on the director of the department of licensing and regulatory

affairs by section 4 of the Stille-DeRossett-Hale single state construction code act, 1972

PA 230, MCL 125.1504, and Executive Reorganization Order Nos. 2003-1, 2008-4, and

2011-4, MCL 445.2011, 445.2025, and 445.2030)

PART 5. RESIDENTIAL CODE

R 408.30500 Applicable code.

Rule 500. The provisions of the international residential code, 2015 edition, including

appendices A, B, C, D, E, F, G, J, K, N, O, P, R, and S except for Sections R 104.2, R

104.3, R 104.5, R 104.7, R 104.8, R 104.8.1, R 105.3, R 105.3.1, R 105.3.2, R 105.6, R

105.9, R 108.3, R 108.4, R 108.5, R 108.6, R 109.1, R 112.2, R 112.3, R 112.4, R 113.1

to R 113.3, R 113.4, R 114.1 and R 114.2, R 313.1.1 to R 313.2.1, R 602.11, R 602.12,

N1102.3.2, tables R 507.2.3, N1101.12.3(3) and figure R 507.2.1(2), R 507.2.3(1), R

507.2.3(2), and R 507.2.4, sections M1411.8, G2411.1.1.1 to G2411.1.1.5, G2439.7.2,

P2503.9, P2709.2.3, P2904.1.1 to P2904.8.2, P2905.1, P2905.2, figure P2904.2.4.2, table

P2904.2.2, tables P2904.6.2(1) to P2904.6.2(9), P3009.1 to P3009.11.1, E3902.15,

E3902.16, E3902.17, and AJ102.4, the IBC-2015, IECC-2015, IMC-2015, IPC-2015,

NFPA 70-2014 listed in chapter 44 govern the construction, alteration, relocation,

demolition, use, and occupancy of buildings and structures, and, with the exceptions

noted, the international residential code is adopted by reference in these rules. All

references to the International Building Code, International Residential Code,

International Energy Conservation Code, National Electrical Code, International Existing

Building Code, International Mechanical Code, and International Plumbing Code mean

the Michigan Building Code, Michigan Residential Code, Michigan Energy Code,

Michigan Electrical Code, Michigan Rehabilitation Code for Existing Buildings,

Michigan Mechanical Code, and Michigan Plumbing Code, respectively. The code is

available for inspection and purchase at the Department of Licensing and Regulatory

Affairs, Bureau of Construction Codes, 611 W. Ottawa St., 1^stFloor Ottawa Building,

Lansing, Michigan 48933. The code may be purchased from the International Code

Council, through the bureau’s website at www.michigan.gov/bcc, at a cost as of the time

of adoption of these rules of $118.00.

History: 2015 AACS; 2021 AACS; 2022 MR 2, Eff. Feb. 8, 2022.

R 408.30501 Title.

Rule 501. Section R101.1 of the code is amended to read as follows:

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R101.1. Title. These provisions shall be known and cited as the Michigan residential

code for 1-and 2-family dwellings and will be referred to as “the code.”

History: 2001 AACS; 2010 AACS; 2015 AACS.

R 408.30501a Scope.

Rule 501a. Section R101.2 of the code is amended to read as follows:

R101.2. Scope. The provisions of the Michigan residential code for 1- and 2-family

dwellings shall apply to the construction, alteration, movement, enlargement,

replacement, repair, equipment, use and occupancy, location, removal and demolition of

detached 1- and 2-family dwellings and townhouses not more than 3 stories above grade

plane in height with a separate means of egress and their accessory structures.

Exceptions:

1. Live/work units complying with the requirements of Section 419 of the Michigan

building code may be built as 1- and 2-family dwellings or townhouses. Fire suppression

required by Section 419.5 of the Michigan building code when constructed under the

Michigan residential code for 1- and 2-family dwellings shall conform to Section P2904.

2. Owner-occupied bed and breakfast and board and room facilities may be

constructed in accordance with sections 4b and 13c of the Stille-DeRossett-Hale single

state construction code act, 1972 PA 230, MCL 125.1504b and MCL 125.1513c.

History: 2015 AACS.

R 408.30501b Intent.

Rule 501b. Sections 101.3 and 101.4 of the code are amended to read as follows:

R101.3. Intent. The purpose of this code is to establish minimum requirements to

safeguard the public safety, health, and general welfare through affordability, structural

strength, means of egress facilities, stability, sanitation, light and ventilation, energy

conservation, and safety to life and property from fire and other hazards attributed to the

built environment, and to provide safety to fire fighters and emergency responders during

emergency operations. The Stille-DeRossett-Hale single state construction code act, 1972

PA 230, MCL 125.1501 to MCL 125.1531 takes precedence over all provisions of this

code.

R101.4. Severability. If any section, subsection, sentence, clause, or phrase of this

code is found to be invalid by a court of competent jurisdiction, such decision will not

affect the validity of the remaining portions of this code.

History: 2021 MR 11, Eff. Oct. 4, 2021.

R 408.30501c Existing structures.

Rule 501c. Section 102.7 is amended to read as follows:

R102.7. Existing structures. The legal occupancy of any structure existing on the

date of adoption of this code shall be permitted to continue without change, except as is

specifically covered in this code, the international property maintenance code, or the

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international fire code, or as allowed under the Stille-DeRossett-Hale single state

construction code act, 1972 PA 230, MCL 125.1501 to MCL 125.1531.

History: 2021 MR 11, Eff. Oct. 4, 2021.

R 408.30502 Rescinded.

History: 2001 AACS; 2011 AACS.

R 408.30503 Approved materials and equipment.

Rule 503. Sections R104.9 of the code is amended to read as follows:

R104.9. Approved materials and equipment. Materials, equipment, and devices

shall be constructed or installed in accordance with approvals granted under the act or by

the building official. The building official shall review reports prepared by recognized

evaluation services and determine if the intent of the code is met.

History: 2001 AACS; 2004 AACS; 2008 AACS.

R 408.30504 Duties and powers of building official.

Rule 504. Sections R104.6 of the code are amended to read as follows:

R104.6. Right of entry. If a building or premises is occupied, the code official shall

present his or her credentials to the occupant and request entry. If a building or premises

is unoccupied, the code official shall first make a reasonable effort to locate either the

owner, the owner’s authorized agent or other person having care or control of the

building or premises and request entry. If entry is refused, the code official has recourse

to every remedy provided by law to secure entry.

When a code official has first obtained a proper inspection warrant or other remedy

provided by law to secure entry, the owner, owner’s authorized agent or occupant or

person having charge, care or control of the building or premises shall not fail or neglect,

after a proper request is made as provided in this rule, to permit the code official prompt

entry into the building or premises to inspect or examine the building or premises

pursuant to this code.

History: 2001 AACS; 2008 AACS; 2010 AACS; 2021 MR 11, Eff. Oct. 4, 2021.

R 408.30505 Work exempt from permit.

Rule 505. Section R105.2 of the code is amended to read as follows:

R105.2. Work exempt from permit. Exemption from the permit requirements of the

code shall not be deemed to grant authorization for any work to be done in any manner in

violation of the provisions of the code or any other laws or ordinances of this jurisdiction.

Permits are not required for any of the following:

(a) Building permits shall not be required for any of the following:

(i) One-story detached accessory structures, if the floor area does not exceed 200

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square feet (18.58 m²).

(ii) A fence that is not more than 7 feet (2 134 mm) high.

(iii) A retaining wall that is not more than 4 feet (1 219 mm) in height measured

from the bottom of the footing to the top of the wall, unless supporting a surcharge.

(iv) A water tank supported directly upon grade if the capacity is not more than

5,000 gallons (18 927 L) and the ratio of height to diameter or width is not greater

than 2

to 1.

(v) A sidewalk and driveway not more than 30 inches (762 mm) above adjacent

grade and not over any basement or story below and not part of an accessible route.

(vi) Painting, papering, tiling, carpeting, cabinets, counter tops, and similar finish

work.

(vii) A prefabricated swimming pool that is less than 24 inches (610 mm) deep, and

not greater than 5,000 gallons (18 925 L), and is installed entirely above ground.

(viii) Swings and other playground equipment accessory to detached 1- or 2-family

dwellings.

(ix) Window awnings in group R-3 and U occupancies, supported by an exterior

wall that do not project more than 54 inches (1 372 mm) from the exterior wall and

do not require additional support, as applicable in Section 101.2 and group U

occupancies.

(x) Decks, porches, patios, landings, or similar structures not exceeding 200 square

feet (18.58 m²) in area, that are not more than 30 inches (762 mm) above grade at any

point as prescribed by Section R312.1.1, are not attached to a dwelling or its accessory

structures, are not within 36 inches (914 mm) of a dwelling or its accessory structures,

and do not serve any ingress or egress door of the dwelling or its accessory structures.

(b) Electrical permits shall not be required, as in accordance with the Michigan

electrical code, R 408.30801 to R 408.30880, for any of the following:

(i) Repairs and maintenance: Minor repair work, including the replacement of lamps

or the connection of approved portable electrical equipment to approved permanently

installed receptacles.

(ii) Radio and television transmitting stations: The provisions of the code do not

apply to electrical equipment used for radio and television transmissions, but do apply to

equipment and wiring for power supply and to the installation of towers and antennas.

(iii) Temporary testing systems: A permit is not required for the installation of any

temporary system required for the testing or servicing of electrical equipment or

apparatus.

(c) Mechanical permits shall not be required for any of the following:

(i) A portable heating or gas appliance that has inputs of less than 30,000 BTU’s per

hour.

(ii) Portable ventilation appliances and equipment.

(iii) A portable cooling unit.

(iv) Steam, hot water, or chilled water piping within any heating or cooling

equipment or appliances regulated by this code.

(v) Replacement of any minor part that does not alter the approval of equipment or

an appliance or make such equipment or appliance unsafe.

(vi) A portable evaporative cooler.

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(vii) Self-contained refrigeration systems that contain 10 pounds (4.5 kg) or less of

refrigerant, or that are actuated by motors of 1 horsepower (0.75kW) or less.

(viii) Portable fuel cell appliances that are not connected to a fixed piping system

and are not interconnected to a power grid.

(ix) An oil burner that does not require connection to a flue, such as an oil stove and

a heater equipped with a wick.

(x) A portable gas burner that has inputs of less than 30,000 BTU’s per hour.

(xi) When changing or relocating a gas meter or regulator, a permit is not required

when installing gas piping which shall be limited to 10 feet (3 005 mm) in length and not

more than 6 fittings.

(xii) When installing geothermal vertical closed loops under the supervision of a

mechanical contractor licensed in HVAC as long as the company meets both the

following:

(A) Has obtained a certificate of registration as a well drilling contractor pursuant to

part 127 of the public health code, 1978 PA 368, MCL 333.12701 to 333.12771.

(B) Has installed the geothermal vertical closed loops in accordance with the

department of environment, Great Lakes, and energy's best practices regarding

geothermal heat pump closed loops. Exemption from the permit requirements of this code

shall not be deemed to grant authorization for work to be done in violation of the

provisions of this code or other laws or ordinances of this jurisdiction.

(d) Plumbing permits shall not be required for either of the following:

(i) The stopping of leaks in drains, water, soil, waste or vent pipe. If any concealed

trap, drainpipe, water, soil, waste or vent pipe becomes defective and it becomes

necessary to remove and replace the same with new material, then the work is considered

as new work and a permit shall be obtained and inspection made as provided in the code.

(ii) The clearing of stoppages or the repairing of leaks in pipes, valves, or fixtures,

and the removal and reinstallation of water closets, if the repairs do not involve or require

the replacement or rearrangement of valves, pipes, or fixtures.

History: 2001 AACS; 2004 AACS.; 2008 AACS; 2010 AACS; 2015 AACS; 2021 MR 11, Eff. Oct.

4, 2021.

R 408.30506 Submittal documents.

Rule 506. Sections R 106.1.4 and R802.10.1 of the code are amended and

Section R106.1.4 and figure 802.10.1 are added to the code to read as follows:

R106.1.4. Truss design data. As an alternative to the submission of truss design

drawings, figure R802.10.1, the truss design data sheet, may be provided to the building

official as part of the construction documents at the time of application. Truss design

drawings shall be submitted to the building official prior to truss installation as required

by Section R802.10.1.

R802.10.1 Truss design drawings. Truss design drawings,

prepared in conformance with Section R802.10.1, shall be provided to the building

official and approved prior to installation. The truss design data sheet, figure R802.10.1,

may be provided to the building official at the time of permit application, as an

alternative to design drawings as permitted in Section R106.1.4. Truss design drawings

shall include, at a minimum, the information specified below. Truss design drawings

shall be provided with the shipment of trusses delivered to the jobsite.

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(1) Slope or depth, span, and spacing.

(2) Location of all joints.

(3) Required bearing widths.

(4) Design loads as applicable.

(a) Top chord live load (including snow loads).

(b) Top chord dead load.

(c) Bottom chord live load.

(d) Bottom chord dead load.

(e) Concentrated loads and their points of application.

(f) Controlling wind and earthquake loads.

(5) Adjustments to lumber and joint connector design values for conditions of use.

(6) Each reaction force and direction.

(7) Joint connector type and description (e.g., size, thickness, or gauge) and the

dimensioned location of each joint connector except where symmetrically located relative

to the joint interface.

(8) Lumber size, species, and grade for each member.

(9) Connection requirements for the following:

(a) Truss to truss girder.

(b) Truss ply to ply.

(c) Field splices.

(10) Calculated deflection ratio and/or maximum description for live and total load.

(11) Maximum axial compression forces in the truss members to enable the building

designer to design the size, connections, and anchorage of the permanent continuous

lateral bracing. Forces shall be shown on the truss design drawing or on supplemental

documents.

(12) Required permanent truss member bracing location.

History: 2001 AACS; 2004 AACS.; 2008 AACS; 2010 AACS; 2015 AACS; 2021 MR 11, Eff. Oct.

4, 2021.

R 408.30507 Duct termination.

Rule 507. Section M1502.3 of the code is amended to read as follows:

M1502.3. Exhaust ducts shall terminate on the outside of the building. Exhaust duct

terminations shall be in accordance with the dryer manufacturer’s installation

instructions. If the manufacturer’s instructions do not specify a termination location, the

exhaust duct shall terminate no less than 3 feet (914 mm) in any direction from openings

into buildings or ventilated section in a soffit. Exhaust duct terminations shall be

equipped with a backdraft damper. Screens shall not be installed at the duct termination.

History: 2001 AACS; 2008 AACS; 2010 AACS; 2015 AACS.

R 408.30508 Payment of fees.

Rule 508. Section R108.1 of the code is amended to read as follows:

R108.1. Fees. The fees prescribed in the act shall be paid to the enforcing agency

of the jurisdiction before a permit to begin work for new construction, alteration,

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removal, demolition, or other building operation may be issued. In addition, an

amendment to a permit necessitating an additional fee shall not be approved until the

additional fee is paid.

History: 2001 AACS; 2004 AACS.; 2008 AACS.

R 408.30509 Frame and masonry inspection.

Rule 509. Section R109.1.4 of the code is amended to read as follows:

R109.1.4. Frame and masonry inspection. Inspection of framing construction shall

be made after the roof, all framing, firestopping, draftstopping, and bracing are in place

and after the plumbing, mechanical, and electrical rough inspections are approved.

Masonry inspections shall be made after the completed installation of base course

flashing as specified in section R703.7.5 of the code and water-resistive barrier as

specified in section R703.2 of the code and after the masonry construction is completed.

History: 2001 AACS; 2008 AACS.

R 408.30509a Approval required.

Rule 509a. Section R109.4 of the code is amended to read as follows:

R109.4. Approval required. Work shall not be done beyond the point indicated in

each successive inspection without first obtaining the approval of the building official.

The building official upon notification shall make the requested inspections and shall

either indicate the portion of the construction that is satisfactory as completed, or shall

notify the permit holder or agent of the permit holder wherein portion of the construction

fails to comply with this code. The notification shall include specific reference to the

code chapter and section numbers in violation in writing. Any portions that do not

comply shall be corrected and such portion shall not be covered or concealed until

authorized by the building official.

History: 2015 AACS.

R 408.30510 Use and occupancy.

Rule 510. Sections R110.1, R110.2, and R110.3 of the code are amended to read as

follows:

R110.1. Use and occupancy. A building or structure shall not be used or occupied,

and a change in the existing occupancy classification of a building or structure or portion

thereof shall not be made, until a certificate of occupancy has been issued in accordance

with the act.

R110.2. Change in use. A change in the character or use of an existing structure

shall not be made, except as specified in the Michigan building code, R 408.30401 to

R 408.30499.

R110.3 Certificate issued. After the building official inspects the building or

structure and finds no violations of the provisions of this code or other laws that are

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enforced by the department of building safety, the building official shall issue a

certificate of occupancy which shall contain the following:

(a) The building permit number.

(b) The address of the structure.

(c) A description of that portion of the structure for which the certificate is issued.

(d) A statement that the described portion of the structure has been inspected for

compliance with the requirements of this code.

(e) The name of the building official.

(f) The edition of the code under which the permit was issued.

(g) Any special stipulations and conditions of the building permit.

History: 2001 AACS; 2004 AACS.; 2008 AACS; 2015 AACS.

R 408.30510a Fire classification.

Rule 510a. Section R902.1 is amended and Sections R902.3 and R902.4 of the code

are added to read as follows:

R902.1. Roof covering materials. Roofs shall be covered with materials as set forth

in Sections R904 and R905. Class A, B, or C roofing shall be installed in jurisdictions

designated by law as requiring their use or where the edge of the roof is less than 3 feet

(914 mm) from a lot line. Classes A, B, and C roofing required by this section to be

listed shall be tested in accordance with UL 790 or ASTM E 108.

Exceptions:

1. Class A roof assemblies include those with coverings of brick, masonry, and

exposed concrete roof deck.

2. Class A roof assemblies also include ferrous or copper shingles or sheets, metal

sheets and shingles, clay or concrete roof tile, or slate installed on noncombustible decks.

3. Class A roof assemblies include minimum 16 ounces per square foot copper

sheets installed over combustible decks.

4. Class A roof assemblies include slate installed over underlayment over

combustible decks.

History: 2015 AACS.

R 408.30511 Violation penalties.

Rule 511. Section R113.4 of the code is amended to read as follows:

R113.4. Violation penalties. It is unlawful for any person, firm, or corporation to

violate a provision of the code or fail to conform with any of the requirements thereof, or

erect, construct, alter, extend, repair, move, remove, demolish, or occupy any building,

structure, or equipment regulated by the code, or cause work to be performed or done in

conflict with or in violation of the approved construction documents or directive of

the enforcing agency, or a permit or certificate issued under the code. A violator shall be

assessed a fine in accordance with the act.

History: 2001 AACS; 2004 AACS; 2008 AACS.

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R 408.30512 Rescinded.

History: 2001 AACS; 2004 AACS; 2008 AACS; 2015 AACS; 2021 MR 11, Eff. Oct. 4, 2021.

R 408.30513 Definitions.

Rule 513. The definitions of attic and sunroom addition in Section R202 of the code

are amended to read as follows:

R202. Definitions. “Attic, uninhabitable with limited storage” means uninhabitable

attics with limited storage where the minimum clear height between joists and rafters is

42 inches (1 063 mm) or greater or where there are not 2 or more adjacent trusses with

web configurations capable of accommodating an assumed rectangle 42 inches (1 063

mm) high by 24 inches (610 mm) in width, or greater, within the plane of the trusses.

“Attic, uninhabitable without storage” means uninhabitable attics without storage where

the maximum clear height between joists and rafters is less than 42 inches (1 063 mm), or

where there are not 2 or more adjacent trusses with web configurations capable of

accommodating an assumed rectangle 42 inches (1 063 mm) high by 24 inches (610 mm)

in width, or greater, within the plane of the trusses. Building Inspector” means the

individual who is responsible for the administration and enforcement of the construction

of buildings, structures, or appurtenances under the state construction code specified in R

408.30499 and who is registered in compliance with 2016 PA 407, MCL 339.5101 to

339.6133. “Building Official” means the person who is appointed and employed by a

governmental subdivision, who is charged with the administration and enforcement of the

state codes specified in R 408.30499, and who is registered in compliance with 2016 PA

407, MCL 339.5101 to 339.6133. “Registered design professional” means an individual

who is licensed under the occupational code, 1980 PA 299, MCL 339.101 to 339.2919.

“ Registered inspector” means an individual who is licensed under the occupational

code, 1980 PA 299, MCL 339.101 to 339.2919."Sunroom addition" means a new

structure with glazing in excess of 40% of the gross area of the structure's exterior walls

and roof added to an existing dwelling.

History: 2001 AACS; 2004 AACS.; 2008 AACS; 2010 AACS; 2015 AACS; 2021 MR 11, Eff. Oct.

4, 2021.

R 408.30514 Rescinded.

History: 2001 AACS; 2004 AACS; 2008 AACS; 2015 AACS; 2021 MR 11, Eff. Oct. 4, 2021.

R 408.30515 Ground snow loads.

Rule 515. Figure R301.2(5) and Table R301.2(1) of the code are amended and

Table R301.2(5) is added to the code to read as follows:

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Table R301.2(5)

Michigan Ground Snow Loads by Jurisdiction

County

Ground Snow

Jurisdictions

ALCONA

ALGER

ALLEGAN

50

70

50

35

All

All except:

CITY OF ALLEGAN

CITY OF OTSEGO

CITY OF PLAINWELL

CITY OF WAYLAND

VILLAGE OF

HOPKINS

VILLAGE OF MARTIN

TOWNSHIP OF

ALLEGAN

TOWNSHIP OF DORR

TOWNSHIP OF GUN

PLAIN

TOWNSHIP OF

HOPKINS

TOWNSHIP OF

LEIGHTON

TOWNSHIP OF

MARTIN

TOWNSHIP OF

MONTEREY

TOWNSHIP OF

OTSEGO

TOWNSHIP OF SALEM

TOWNSHIP OF

TROWBRIDGE

TOWNSHIP OF

WATSON

TOWNSHIP OF

WAYLAND

ALPENA

ANTRIM

50

60

All

All except

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70

TOWNSHIP OF BANKS

TOWNSHIP OF CENTRAL

LAKE TOWNSHIP OF ECHO

TOWNSHIP OF JORDAN

TOWNSHIP OF WARNER

All

ARENAC

BARAGA

BARRY

40

70

35

All

All except:

30

VILLAGE OF NASHVILLE

TOWNSHIP OF

ASSYRIA

TOWNSHIP OF BARRY

TOWNSHIP OF

JOHNSTOWN

TOWNSHIP OF MAPLE

GROVE

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BAY

35

40

All except:

CITY OF PINCONNING

TOWNSHIP OF FRASER

TOWNSHIP OF GARFIELD

TOWNSHIP OF GIBSON

TOWNSHIP OF MT.

FOREST

TOWNSHIP OF

PINCONNING

BENZIE

BERRIEN

BRANCH

60

50

25

20

All

All except:

TOWNSHIP OF ALGANSEE

TOWNSHIP OF

CALIFORNIA

TOWNSHIP OF GILEAD

TOWNSHIP OF

KINDERHOOK

TOWNSHIP OF OVID

CALHOUN

25

All except:

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30

CITY OF BATTLE CREEK

CITY OF MARSHALL

CITY OF SPRINGFIELD

VILLAGE OF ATHENS

TOWNSHIP OF

ATHENS

TOWNSHIP OF

BATTLE

CREEK

TOWNSHIP OF

BEDFORD

TOWNSHIP OF CONVIS

TOWNSHIP OF EMMET

TOWNSHIP OF LEE

TOWNSHIP OF LEROY

TOWNSHIP OF

MARENGO

TOWNSHIP OF

MARSHALL

TOWNSHIP OF

NEWTON

TOWNSHIP OF

PENNFIELD

CASS

30

50

All except:

CITY OF DOWAGIAC

VILLAGE OF

CASSOPOLIS

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VILLAGE OF

EDWARDSBURG

TOWNSHIP OF HOWARD

TOWNSHIP OF LA GRANGE

TOWNSHIP OF

MILTON

TOWNSHIP OF

POKAGON

TOWNSHIP

OF

SILVER

CREEK

TOWNSHIP OF WAYNE

CHARLEVOIX

CHEBOYGAN

70

60

All

All except:

CITY OF CHEBOYGAN

VILLAGE OF AFTON

VILLAGE OF

WOLVERINE

TOWNSHIP OF ALOHA

TOWNSHIP OF

BENTON

TOWNSHIP OF ELLIS

TOWNSHIP OF

GRANT

TOWNSHIP OF

KOEHLER

TOWNSHIP OF NUNDA

TOWNSHIP OF

WALKER

TOWNSHIP OF

WAVERLY

TOWNSHIP OF WILMOT

50

TOWNSHIP OF FOREST

CHIPPEWA

70

60

All except:

VILLAGE OF DE TOUR

TOWNSHIP OF

DETOUR

TOWNSHIP OF

RABER

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CLARE

40

50

All except:

TOWNSHIP OF

SUMMERFIELD

TOWNSHIP OF

WINTERFIELD

CLINTON

30

35

All except:

CITY OF ST. JOHNS

VILLAGE OF FOWLER

VILLAGE OF MAPLE RAPIDS

VILLAGE OF

WESTPHALIA

TOWNSHIP OF

BENGAL

TOWNSHIP OF

DALLAS

TOWNSHIP OF ESSEX

TOWNSHIP OF

GREENBUSH

TOWNSHIP OF LEBANON

TOWNSHIP OF

WESTPHALIA

CRAWFORD

DELTA

50

60

70

All

All except:

TOWNSHIP OF GARDEN

TOWNSHIP OF

MASONVILLE

TOWNSHIP OF NAHMA

DICKINSON

EATON

60

30

35

All

All except:

VILLAGE OF MULLIKEN

VILLAGE OF

SUNFIELD

TOWNSHIP OF

SUNFIELD

All

EMMET

70

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GENESEE

30

25

All except:

CITY OF DAVISON

CITY OF FENTON

CITY OF GRAND

BLANC

CITY OF LINDEN

VILLAGE OF GAINES

VILLAGE OF

GOODRICH

TOWNSHIP OF

ARGENTINE

TOWNSHIP OF ATLAS

TOWNSHIP OF

DAVISON TOWNSHIP OF

FENTON TOWNSHIP

OF GRAND

GLADWIN

GOGEBIC

GRAND

GRATIOT

HILLSDALE

40

60

35

20

25

All

All except:

CITY OF LITCHFIELD

TOWNSHIP OF

LITCHFIELD

TOWNSHIP OF SCIPIO

HOUGHTON

80

70

All except:

TOWNSHIP OF ADAMS

TOWNSHIP OF CHASSELL

TOWNSHIP OF DUNCAN

TOWNSHIP OF ELM RIVER

TOWNSHIP OF LAIRD

TOWNSHIP OF PORTAGE

Page 18

Courtesy of Michigan Administrative Rules

HILLSDALE

20

90

All except:

VILLAGE OF CALUMET

VILLAGE OF COPPER

CITY

VILLAGE OF

LINDEN

VILLAGE OF

LAURIUM

TOWNSHIP OF

CALUMET

TOWNSHIP OF

LAKE

SCHOOLCRAFT

HURON

INGHAM

35

25

30

All

All except:

CITY OF EAST LANSING

CITY OF LANSING

CITY OF MASON

TOWNSHIP OF

ALAIEDON

TOWNSHIP OF

AURELIUS

TOWNSHIP OF DELHI

TOWNSHIP OF

LANSING

TOWNSHIP OF

MERIDIAN

TOWNSHIP OF

WILLIAMSTOWN

IONIA

IOSCO

IRON

35

40

60

40

35

All

All except:

ISABELLA

VILLAGE OF SHEPHERD

TOWNSHIP OF

CHIPPEWA

TOWNSHIP OF COE

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TOWNSHIP OF FREMONT

TOWNSHIP OF

LINCOLN

TOWNSHIP OF

UNION

JACKSON

25

20

All except:

VILLAGE OF BROOKLYN

TOWNSHIP OF

COLUMBIA

TOWNSHIP OF NORVELL

KALAMAZOO

30

35

All except:

CITY OF PARCHMENT

TOWNSHIP OF

ALAMO

TOWNSHIP OF

COOPER

TOWNSHIP OF

OSHTEMO

KALKASKA

KENT

60

35

40

All

All except:

CITY OF CEDAR SPRINGS

VILLAGE OF

CASNOVIA

VILLAGE OF KENT

CITY

VILLAGE OF SAND

LAKE

VILLAGE OF SPARTA

TOWNSHIP OF

NELSON

TOWNSHIP OF

SOLON

TOWNSHIP OF

SPARTA

TOWNSHIP OF

TYRONE

KEWEENAW

90

All except:

100

TOWNSHIP OF EAGLE

HARBOR

TOWNSHIP OF GRANT

TOWNSHIP OF

HOUGHTON

LAKE

60

All except:

Page 20

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50

TOWNSHIP OF CHASE

TOWNSHIP OF

CHERRY VALLEY

TOWNSHIP OF

ELLSWORTH

TOWNSHIP OF PINORA

TOWNSHIP OF

PLEASANT PLAINS

TOWNSHIP OF YATES

LAPEER

25

30

All except:

VILLAGE OF CLIFFORD

VILLAGE OF

COLUMBIAVILLE

VILLAGE OF NORTH

BRANCH

VILLAGE OF OTTER

LAKE

TOWNSHIP

BURLINGTON

TOWNSHIP

OF

BURNSIDE

TOWNSHIP

DEERFIELD

TOWNSHIP

MARATHON

OF

TOWNSHIP OF NORTH

BRANCH

TOWNSHIP OF OREGON

TOWNSHIP OF RICH

Page 21

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LEELANAU

LENAWEE

LIVINGSTON

LUCE

60

20

25

70

60

70

All

MACKINAC

All except:

TOWNSHIP OF

NEWTON

TOWNSHIP OF

MACOMB

MANISTEE

MARQUETTE

25

60

70

60

All

All except:

TOWNSHIP OF EWING

TOWNSHIP OF WELLS

TOWNSHIP OF

REPUBLIC

MASON

60

40

60

35

40

All

All except:

MECOSTA

MENOMINEE

MIDLAND

CITY OF COLEMAN

VILLAGE OF SANFORD

TOWNSHIP OF

EDENVILLE

TOWNSHIP OF

GENEVA

TOWNSHIP OF HOPE

TOWNSHIP OF MILLS

TOWNSHIP OF

WARREN

MISSAUKEE

50

60

All except:

TOWNSHIP OF

BLOOMFIELD

TOWNSHIP OF

CALDWELL

TOWNSHIP OF PIONEER

Page 22

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MONROE

MONTCALM

20

35

40

All

All except:

VILLAGE OF HOWARD CITY

VILLAGE OF

LAKEVIEW

VILLAGE OF PIERSON

TOWNSHIP OF CATO

TOWNSHIP OF MAPLE

VALLEY

TOWNSHIP OF

PIERSON

TOWNSHIP OF

REYNOLDS

TOWNSHIP OF WINFIELD

MONTMORENCY

MUSKEGON

50

40

50

All

All except

TOWNSHIP OF HOLTON

TOWNSHIP OF BLUE LAKE

60

CITY OF MONTAGUE

CITY OF MUSKEGON

HEIGHTS CITY OF NORTH

MUSKEGON CITY OF NORTON

SHORES CITY OF ROOSEVELT

PARK CITY OF WHITEHALL

TOWNSHIP OF DALTON

TOWNSHIP OF FRUITLAND

TOWNSHIP OF FRUITPORT

TOWNSHIP OF LAKETON

TOWNSHIP OF MONTAGUE

TOWNSHIP OF MUSKEGON

TOWNSHIP OF SULLIVAN

TOWNSHIP OF WHITEHALL

TOWNSHIP OF WHITE RIVER

VILLAGE OF FRUITPORT

VILLABE OF LAKEWOOD

CLUB

Page 23

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NEWAYGO

40

50

All except:

VILLAGE OF HESPERIA

TOWNSHIP OF BARTON

TOWNSHIP OF BEAVER

TOWNSHIP OF DENVER

TOWNSHIP OF HOME

TOWNSHIP OF

LILLEY TOWNSHIP OF

MERRILL

TOWNSHIP OF TROY

OAKLAND

OCEANA

25

60

50

All

All except

VILLAGE OF HESPERIA

VILLAGE OF

WALKERVILLE

TOWNSHIP OF

COLFAX

TOWNSHIP OF

CRYSTAL

TOWNSHIP OF

ELBRIDGE

TOWNSHIP OF FERRY

TOWNSHIP OF

GREENWOOD

TOWNSHIP OF

LEAVITT

TOWNSHIP OF

NEWFIELD

TOWNSHIP OF OTTO

Page 24

Courtesy of Michigan Administrative Rules

OGEMAW

40

50

All except

CITY OF ROSE CITY

TOWNSHIP OF

CUMMINGS

TOWNSHIP OF FOSTER

TOWNSHIP OF

GOODAR

TOWNSHIP OF HILL

TOWNSHIP OF

KLACKING

TOWNSHIP OF

OGEMAW

TOWNSHIP OF ROSE

ONTONAGON

OSCEOLA

70

60

All except:

TOWNSHIP OF HAIGHT

TOWNSHIP OF

INTERIOR

TOWNSHIP OF

MCMILLAN

50

40

All except:

CITY OF EVART

VILLAGE OF HERSEY

TOWNSHIP OF EVART

TOWNSHIP OF HERSEY

TOWNSHIP OF ORIENT

TOWNSHIP OF OSCEOLA

TOWNSHIP OF SYLVAN

OSCODA

OTSEGO

50

All

All except:

60

VILLAGE OF ELMIRA

VILLAGE OF

VANDERBILT

TOWNSHIP OF

CORWITH TOWNSHIP OF

ELMIRA

TOWNSHIP OF HAYES

TOWNSHIP OF

LIVINGSTON

Page 25

Courtesy of Michigan Administrative Rules

OTTAWA

50

35

All except:

TOWNSHIP OF

GEORGETOWN

TOWNSHIP OF JAMESTOWN

TOWNSHIP OF

TALLMADGE

TOWNSHIP OF ZEELAND

40

CITY OF COOPERSVILLE

TOWNSHIP OF

ALLENDALE

TOWNSHIP OF

BLENDON

TOWNSHIP OF

CHESTER

TOWNSHIP OF

POLKTON

TOWNSHIP OF

WRIGHT

PRESQUE ISLE

ROSCOMMON

50

60

50

All except

TOWNSHIP OF BEARINGER

All except

40

TOWNSHIP OF NESTER

SAGINAW

35

All except:

Page 26

Courtesy of Michigan Administrative Rules

30

CITY OF FRANKENMUTH

VILLAGE OF BIRCH

RUN VILLAGE OF

CHESANING VILLAGE OF

OAKLEY TOWNSHIP OF

ALBEE TOWNSHIP OF

BIRCH RUN

TOWNSHIP OF BRADY

TOWNSHIP OF

BRIDGEPORT

TOWNSHIP OF CHAPIN

TOWNSHIP OF

CHESANING

TOWNSHIP OF

FRANKENMUTH

TOWNSHIP OF MAPLE

GROVE

TOWNSHIP OF

ST.CHARLES

Page 27

Courtesy of Michigan Administrative Rules

TOWNSHIP OF

TAYMOUTH

SANILAC

30

25

All except:

VILLAGE OF MELVIN

TOWNSHIP OF

FREMONT TOWNSHIP OF

WORTH

35

VILLAGE OF MINDEN CITY

TOWNSHIP OF AUSTIN

TOWNSHIP OF

GREENLEAF

TOWNSHIP OF MINDEN

SCHOOLCRAFT

SHIAWASSEE

70

30

25

All

All except:

VILLAGE OF BYRON

TOWNSHIP OF BURNS

ST. CLAIR

ST. JOSEPH

25

30

25

All

All except:

CITY OF STURGIS

VILLAGE OF BURR

OAK VILLAGE OF COLON

VILLAGE OF WHITE

PIGEON

TOWNSHIP OF BURR

OAK

TOWNSHIP OF COLON

TOWNSHIP OF FAWN

RIVER

TOWNSHIP OF

SHERMAN TOWNSHIP OF

STURGIS TOWNSHIP OF

WHITE PIGEON

TUSCOLA

30

All except:

Page 28

Courtesy of Michigan Administrative Rules

35

VILLAGE OF CARO

VILLAGE OF CASS

CITY VILLAGE OF

FAIRGROVE VILLAGE OF

GAGETOWN VILLAGE OF

REESE VILLAGE OF

UNIONVILLE

TOWNSHIP OF AKRON

TOWNSHIP OF ALMER

TOWNSHIP OF

COLUMBIA

TOWNSHIP OF

ELKLAND TOWNSHIP OF

ELMWOOD

TOWNSHIP OF

FAIRGROVE

TOWNSHIP OF

GILFORD

TOWNSHIP OF WISNER

VAN BUREN

50

30

All except:

TOWNSHIP OF PORTER

35

CITY OF GOBLES

VILLAGE OF

DECATUR VILLAGE OF

LAWTON VILLAGE OF

MATTAWAN

VILLAGE OF PAW

PAW TOWNSHIP OF

ALMENA TOWNSHIP OF

ANTWERP TOWNSHIP OF

BLOOMINGDALE

TOWNSHIP OF DECATUR

TOWNSHIP OF PAW PAW

TOWNSHIP OF PINE

GROVE

TOWNSHIP OF WAVERLY

Page 29

Courtesy of Michigan Administrative Rules

WASHTENAW

25

20

All except:

CITY OF ANN ARBOR

CITY OF SALINE

CITY OF YPSILANTI

VILLAGE OF

MANCHESTER

TOWNSHIP OF

AUGUSTA TOWNSHIP OF

BRIDGEWATER

TOWNSHIP OF LODI

TOWNSHIP OF

MANCHESTER

TOWNSHIP OF

PITTSFIELD

TOWNSHIP OF SALINE

TOWNSHIP OF SUPERIOR

TOWNSHIP OF YORK

TOWNSHIP OF YPSILANTI

WAYNE

20

25

All except

Northville

All except

WEXFORD

60

50

TOWNSHIP OF CLAM

LAKE

History: 2001 AACS; 2004 AACS; 2010 AACS.

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R 408.30516 Design criteria.

Rule 516. Table R301.2(1) of the code is amended and figures R301.2(7) and R301.2(8) are added to the code to read as follows:

TABLE R 301.2(1)

CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA

Wi

nd

Sp

eed^d

(m

ph)

Seismic

Design

Categor

y^f

Subject to Damage From

Winter

Design

Temp^e

Ice Barrier

Underlaym

ent

Flood

Hazard

s^g

Air

Mean

Annual

Temp^j

Ground

Snow

Load

Freezing

Indexⁱ

Required^h

Weatheri

Frostli

Termit

ng^a

ne depth^b

e^c

See

Table

R301.2(

5)

Sec.R301.2.

90 2.1 & Figure

42”

See

Note b

Figure

R301.2(6)

See

Note e

See

Note g

Figure

R403.3(2)

See

footnote J

Severe

Yes

R301.2(

2)

For SI: 1 pound per square foot = 0.0479 kN/m2, 1 mile per hour = 1.609 km/h.

(a) Weathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements

of this code. The weathering column shall be filled in with the weathering index (i.e., “negligible”, “moderate,” or “severe”) for

concrete as determined from the weathering probability map [figure R301.2(3)]. The grade of masonry units shall be determined from

ASTM C 34, C 55, C 62, C 73, C 90, C 129, C 145, C 216 or C 652 as listed in chapter 44.

(b) The frost line depth may be modified as provided in section R403.1.4 of the code.

(c) The jurisdiction shall fill in this part of the table to indicate the need for protection depending on whether there has been a

history of local damage.

(d) The jurisdiction shall fill in this part of the table with the wind speed from the basic wind speed map [figure R301.2(4)].

Wind exposure category shall be determined on a site-specific basis in accordance with section R301.2.1.4 of the code.

(e) The winter design temperature criteria shall be taken from appendix D of the Michigan plumbing code, R 408.30701 to R

408.30796.

(f) Design category determined from section R301.2.2.1 of the code.

(g) The jurisdiction shall fill in this part of the table with both of the following:

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(i) The date of the jurisdiction’s entry into the national flood insurance program (date of adoption of the first code or ordinance

for management of flood hazard areas).

(ii) The date(s) of the currently effective FIRM and FBFM or other flood hazard map adopted by the community, as may be

amended. Absent (i) or (ii), flood hazard areas as determined by the state under its administration of the Part 31, floodplain regulatory

authority of the natural resources and environmental protection act, 1994 PA 451, MCL 324.101 to 324.90106, shall become the basis

for regulation of floodplain development within the community and section R408.7 of the code shall apply to buildings and structures

within those areas.

(h) In accordance with sections R905.2.7, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1 of the code, for areas

where the average daily temperature in January is 25 degrees Fahrenheit (-4 degrees Celsius) or less, or where there has been a history

of local damage from the effects of ice damming, the jurisdiction shall fill in this part of the table with “YES”. Otherwise, the

jurisdiction shall fill in this part of the table with “NO”.

(i) The jurisdiction shall fill in this part of the table with the 100-year return period air freezing index (bf-days) from figure

R403.3(2) or from the 100-year (99%) value on the national climatic data center data table “air freezing index-USA method (base 32

degrees Fahrenheit)”.

(j) The jurisdiction shall fill in this part of the table with the mean annual temperature from the national climatic data center data

table “air freezing index-USA method (base 32 degrees Fahrenheit)” at www.ncdc.noaa.gov/fpsf.html

History: 2001 AACS; 2008 AACS; 2010 AACS; 2015 AACS.

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R 408.30517 Rescinded.

History: 2001 AACS; 2004 AACS.

R 408.30517a Sanitary facilities.

Rule 517a. Section R306.1 of the code is amended to read as follows:

R306.1. Sanitary facilities. Every dwelling unit shall be provided with a water

closet, lavatory, bathtub or shower, and automatic clothes washer connection.

History: 2010 AACS.

R 408.30518 Means of egress.

Rule 518. Sections R311.6.4 and R311.2.1 are added to the code and R311.2 of the

code is amended to read as follows:

R311.6.4 Modular ramps. Modular ramp systems approved pursuant to the act are

not required to comply with the requirements of section R403.1.4 of the code.

R311.2. Door type and size. The required exit door shall be a side-hinged door not

less than 3 feet (914 mm) in width and 6 feet, 8 inches (2 032 mm) in height. Other

exterior hinged or sliding doors shall not be less than 24 inches (6096 mm) in width and 6

feet, 6 inches (1 981 mm) in height.

R311.2.1. Interior doors. Interior doors shall be not less than 24 inches (6096 mm) in

width and 6 feet, 6 inches (1524 mm) in height.

Exception: Doors to areas less than 10 square feet of floor area.

History: 2001 AACS; 2004 AACS.; 2008 AACS; 2010 AACS; 2015 AACS.

R 408.30519 Treads and risers.

Rule 519. Sections R311.7.4.1 and R 311.7.4.2 of the code are amended to read as

follows:

R311.7.5.1. Riser height. The maximum riser height shall be 8 1/4 inches (210 mm).

The riser shall be measured vertically between leading edges of the adjacent treads. The

greatest riser height within any flight of stairs shall not exceed the smallest by more than

3/8 inch (9.5 mm)

R311.7.5.2. Tread depth. The minimum tread depth shall be 9 inches (229 mm).

The tread depth shall be measured horizontally between the vertical planes of the

foremost projection of adjacent treads and at a right angle to the tread's leading edge.

The greatest tread depth within any flight of stairs shall not exceed the smallest by more

than 3/8 inch (9.5 mm). Winder treads shall have a minimum tread depth of 10 inches

(254 mm) measured as above at a point 12 inches (305 mm) from the side where the

treads are narrower. Winder treads shall have a minimum tread depth of 6 inches (152

mm) at any point. Within any flight of stairs, the greatest winder tread depth at the 12-

inch (305 mm) walk line shall not exceed the smallest by more than 3/8 inch (9.5 mm).

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History: 2001 AACS; 2004 AACS; 2010 AACS.

Editor's Note: An obvious error in R 408.30519 was corrected at the request of the promulgating

agency, pursuant to Section 56 of 1969 PA 306, as amended by 2000 PA 262, MCL 24.256. The rule

containing the error was published in Annual Administrative Code Supplement, 2010. The memorandum

requesting the correction was published in Michigan Register, 2016 MR 3.

R 408.30520 Where required in existing dwellings.

Rule 520. Section R315.3 of the code is amended to read as follows:

R315.3. Where required in existing dwellings. Where work requiring a building

permit occurs in existing dwellings that have attached garages or in existing dwellings

within which fuel-fired appliances exist, carbon monoxide alarms shall be provided in

accordance with Section R315.1.

History: 2001 AACS; 2004 AACS.; 2008 AACS; 2010 AACS; 2015 AACS.

R 408.30521 Elevation requirements.

Rule 521. Section R322.2.1 of the code is amended to read as follows;

R322.2.1. Elevation requirements. (1) Buildings and structures shall have the

lowest floor including basements elevated so the lowest point of the floor's concrete or

subfloor surface is 1 foot (305 mm) or more above the design flood elevation. The

bottom of the lowest horizontal structural member of the floor system shall not be lower

than the design flood elevation. Compliance with this elevation requirement shall be

based upon measurement taken from the floor surface without the final floor covering

and from the bottom of the lowest horizontal structural member of the floor system.

(2) Crawl space interior floor grade elevation shall comply with R408.6 of the code.

(3) Basement floors that are below grade on all sides shall be considered lowest

floors and shall be elevated so that the lowest point of the floor surface is 1 foot (305

mm) or more above the design flood elevation.

Compliance with this elevation requirement shall be based upon measurement taken

from the floor surface without the final floor covering.

Exception: Enclosed areas below the design flood elevation, including basements

that have floors which are not below grade on all sides, shall meet the requirements of

section R322.2.2 of the code.

History: 2001 AACS; 2004 AACS; 2008 AACS; 2010 AACS.

R 408.30521a Rooftop mounted photovoltaic panel systems.

Rule 521a. Sections R909.1, R909.2, and R909.3 of the code are added to read as

follows:

R909.1. General. The installation of photovoltaic panel systems that are mounted

on or above the roof covering shall comply with the provisions of this code, Section

R324, and NFPA 70.

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R909.2. Structural requirements. Rooftop mounted photovoltaic panel systems

shall be designed to structurally support the system and withstand gravity loads in

accordance with chapter 3. The roof upon which these systems are installed shall be

designed and constructed to support the loads imposed by such systems in accordance

with chapter 8.

R909.3. Installation. Rooftop mounted photovoltaic systems shall be installed in

accordance with the manufacturer’s instructions. Roof penetrations shall be flashed and

sealed in accordance with this chapter.

History: 2015 AACS.

R 408.30522 Minimum depth.

Rule 522. Section R403.1.4 of the code is amended to read as follows:

R403.1.4. Minimum depth. All exterior footings and foundation systems shall

extend 42 inches below actual grade. Where applicable, the depth of the footings shall

also conform to section R403.1.4.1 of the code.

Exception:

Upon evidence of the existence of any of the following conditions, the building

official may modify the footing depth accordingly:

(a) Freezing temperatures (freezing degree days).

(b) Soil type.

(c) Ground water conditions.

(d) Snow depth experience.

(e) Exposure to the elements.

(f) Other specific conditions identified by the building official that may affect the

foundation system.

History: 2001 AACS; 2004 AACS; 2008 AACS; 2015 AACS.

R 408.30522a Vapor retarders.

Rule 522a. Section R601.3 of the code is amended to read as follows:

R601.3. Vapor retarders. Class I or II vapor retarders shall be provided on the

interior side of frame walls in zones 5, 6, 7, 8, and marine 4.

Exceptions:

1. As permitted in table R702.7.1.

2. Class III or no vapor retarder shall be permitted on the interior side of below

grade wall assemblies. Class I or II vapor retarders shall be permitted on the interior side

of the wall assembly when no air permeable insulation is installed in the below grade

wall assemblies.

3. Construction where moisture or its freezing will not damage the materials.

History: 2008 AACS; 2010 AACS; 2015 AACS.

R 408.30522b Air freezing index.

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Rule 522b. Table R403.3(2) of the code is amended to read as follows:

Table R403.3(2)

Air Freezing Index for Michigan Locations by County

1500 or

Berrien

2000

All

2500

Alger

3000

Baraga

3500

Gogebic

4000

Branch

Cass

counties not Charlevoix

Dickinson

Iron

Keweenaw

Marquette

Houghton

Ontonagon

listed

Cheboygan

Chippewa

Crawford

Kalamazoo

Macomb

Ottawa

St. Clair

St. Joseph

Delta Emmet

Iosco Kalkaska

Lake Luce

Mackinac

Menominee

Missaukee

Montmorency

Ogemaw

Osceola

Otsego

Roscommon

Schoolcraft

Wexford

History: 2010 AACS.

R 408.30523 Rescinded.

History: 2001 AACS; 2004 AACS.

R 408.30523 Placement of lag screws or bolts in deck ledgers and band joists.

Rule 523. Figure R507.2.1(1) of the code is amended to read as follows:

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FIGURE R507.2.1(1)

PLACEMENT OF LAG SCREWS AND BOLTS IN LEDGERS

History: 2015 AACS.

R408.30523a Flashing.

Rule 523a. Section R507.2.4 is added and figure R507.2.1(2) is amended to read as

follows:

R507.2.4. Flashing. An approved corrosion resistant flashing as required by Section

R703.8 shall be installed above the attached ledger as shown in figure R507.2.1(2) or as

approved.

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History: 2015 AACS.

R 408.30524 Michigan uniform energy code.

Rule 524. Buildings shall be designed and constructed in accordance with the

Michigan uniform energy code part 10 rules, R 408.31001 to R 408.31099.

History: 2001 AACS; 2004 AACS.

R 408.30525 Scope.

Rule 525. Section M1301.1 of the code is amended to read as follows:

M1301.1. Scope. The provisions of this chapter shall govern the installation of

mechanical systems not specifically covered in other chapters applicable to mechanical

systems. Installations of mechanical appliances, equipment, and systems not addressed

by the code shall comply with the applicable provisions of the Michigan mechanical

code, R 408.30901 to R 408.30998 and the international fuel gas code.

History: 2001 AACS; 2008 AACS.

R 408.30525a Simplified wall bracing.

Rule 525a. Section R 602.10.9 is amended to read as follows:

R602.10.9. Braced wall panel support. Braced wall panel support shall be provided

as follows:

1. Cantilevered floor joists complying with section R502.3.3 shall be permitted to

support braced wall panels.

2. Raised floor system post or pier foundations supporting braced wall panels shall

be designed in accordance with accepted engineering practice.

3. Masonry stem walls with a length of 48 inches (1 219 mm) or less supporting

braced wall panels shall be reinforced in accordance with figure R602.10.9. Masonry

stem walls with a length greater than 48 inches (1 219 mm) supporting braced wall panels

shall be constructed in accordance with section R403.1. Methods ABW and PFH shall

not be permitted to attach to masonry stem walls.

4. Concrete stem walls with a length of 48 inches (1 219 mm) or less, greater than

12 inches (305 mm) tall shall have reinforcement sized and located in accordance with

figure R602.10.9.

History: 2015 AACS.

R 408.30526 Rescinded.

History: 2001 AACS; 2004 AACS; 2008 AACS; 2015 AACS.

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R 408.30527 Standards.

Rule 527. Section M2001.1.1 of the code is amended to read as follows:

M2001.1.1. Standards. Oil-fired boilers and their control systems shall be listed

and labeled in accordance with UL 726. Electric boilers and their control systems shall

be listed in accordance with UL 834. Solid-fuel-fired boilers shall be listed and labeled

in accordance with UL 2523. Boilers shall be designed, constructed, installed, and

maintained in accordance with the requirements of ASME CSD-1 and ASME boiler and

pressure vessel code, Sections I and IV, except part CE-110(a) of the CSD-1. Gas-fired

boilers shall conform to the requirements listed in chapter 24. It shall be the

homeowner’s responsibility to maintain and operate the boiler in accordance with ASME

CSD-1.

History: 2001 AACS; 2010 AACS; 2015 AACS.

R 408.30528 Terms defined in other codes.

Rule 528. Section G2402.3 of the code is amended to read as follows:

G2402.3. Terms defined in other codes. Where terms are not defined in the code

and are defined in the Michigan electrical code, R 408.30801 to R 408.30880, Michigan

building code, R 408.30401 to R 408.30547, international fire code and international fuel

gas code listed in chapter 44, Michigan mechanical code, R 408.30901 to R 408.30998 or

Michigan plumbing code, R 408.30701 to R 408.30796, the terms shall have the

meanings ascribed to them as in those codes.

History: 2001 AACS; 2008 AACS; 2010 AACS.

R 408.30528a CSST.

Rule 528a. Section G2411.1.1 (310.1.1) of the code is amended to read as follows:

G2411.1.1. CSST. Corrugated stainless steel tubing (CSST) gas piping systems

shall be bonded to the electrical service grounding electrode system or where provided,

lightening protection electrode system. The bonding jumper shall connect to a metallic

pipe, pipe fitting, or CSST fitting between the point of delivery and the CSST utilizing a

device listed for the application. The bonding jumper shall be not smaller than 6 AWG

copper wire or equivalent, not longer than 75 feet and accessible. Gas piping systems

that are bonded in accordance with this section shall be considered effectively bonded

regardless of the amount of CSST in the system. Any additional grounding electrodes

used shall be bonded to the electrical service grounding electrode system, or where

provided, the lighting protection grounding electrode system.

Exception: CSST piping systems tested and listed by the manufacturer for

installation without additional bonding when installed in accordance with the listing.

History: 2010 AACS; 2015 AACS.

R 408.30529 Lining required.

Rule 529. Section P2709.2 of the code is amended to read as follows:

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P2709.2. Lining required. The adjoining walls and floor framing enclosing on-site

built-up shower receptors shall be lined with 1 of the following:

1. Sheet lead.

2. Sheet copper.

3. Plastic liner material that complies with ASTM D 4068 or ASTM D 4551.

4. Sheet-applied load-bearing, bonded waterproof membranes that comply with

ANSI A118.10.

The lining material shall extend not less than 3 inches (76 mm) beyond or around

the rough jambs and not less than 3 inches (76 mm) above finished thresholds. Sheet-

applied load bearing, bonded waterproof membranes shall be applied in accordance with

the manufacturer’s instructions.

History: 2001 AACS; 2008 AACS; 2015 AACS.

R 408.30530 Requirements for discharge pipe.

Rule 530. Section P2803.6.1 of the code is amended to read as follows:

P2803.6.1. Requirements for discharge pipe. Relief valves shall not discharge so as

to be a hazard, a potential cause of damage, or a nuisance.

A relief valve discharge pipe shall be provided for each individual relief valve and

shall meet all of the following:

(a) Shall terminate atmospherically not more than 4 inches (102 mm) from the floor

with an unthreaded end.

(b) Shall not be interconnected.

(c) Valves shall not be connected in the relief valve discharge pipe.

(d) Shall be rigid pipe approved for water distribution, with a minimum temperature

rating of 210 degrees Fahrenheit.

(e) Shall have the same nominal inside diameter as the relief valve outlet and shall

drain by gravity flow.

(f) Shall discharge to the floor, or to the pan serving the water heater or storage

tank, or to a waste receptor.

The outlet of a pressure, temperature, or other relief valve shall not be directly

connected to the drainage system.

History: 2001 AACS; 2008 AACS; 2010 AACS.

R 408.30531 Rescinded.

History: 2001 AACS; 2004 AACS; 2008 AACS; 2015 AACS.

R 408.30532 Roof extension.

Rule 532. Section P3103.1 of the code is amended to read as follows:

P3103.1. Roof extension. All open vent pipes that extend through a roof shall

terminate at least 1 foot (305 mm) above the roof, except that if a roof is to be used for

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any purpose other than weather protection, then the vent extension shall be run not less

than 7 feet (2134 mm) above the roof.

History: 2001 AACS.

R 408.30533 Frost closure.

Rule 533. Section P3103.2 of the code is amended to read as follows:

P3103.2. Frost closure. To prevent frost closure, every vent extension through a

roof shall be not less than 3 inches (76 mm) in diameter. Any increase in the size of the

vent shall be made inside the building with a minimum of 1 foot (305 mm) below the

roof or inside the wall.

History: 2001 AACS.

R 408.30533a Rough plumbing.

Rule 533a. Section P2503.5.1 of the code is amended to read as follows:

P2503.5.1. Rough plumbing. DWV systems shall be tested on completion of the

rough piping installation by water or air with no evidence of leakage. Either test shall be

applied to the drainage system in its entirety or in sections after rough piping has been

installed, as follows:

1. Water test. Each section shall be filled with water to a point not less than 10 feet

(3 048 mm) above the highest fitting connection in that section, or to the highest point in

the completed system. Water shall be held in the section under test for a period of 15

minutes. The system shall prove leak free by visual inspection.

2. Air test. The portion under test shall be maintained at a gauge pressure of 5

pounds per square inch (psi) (34 kPa) or 10 inches (254 mm) of mercury column (34

kPa). This pressure shall be held without introduction of additional air for a period of 15

minutes.

History: 2015 AACS.

R 408.30533b Sewer depth.

Rule 533b. Section P2603.5.1 of the code is amended to read as follows:

P2603.5.1. Sewer depth. A building sewer that connects to a private disposal system

shall be a minimum of 8 inches (203 mm) to the top of the pipe below finished grade at

the point of septic tank connection. Building sewers shall be installed a minimum of 42

inches (1 067 mm) below grade.

Exception: When permitted by the code official.

History: 2015 AACS.

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R 408.30534 Venting.

Rule 534. Section P3105.1 is amended and section 3105.4 and figure P3105.4 are

added to the code and figure N3 in appendix N of the code is amended to read as follows:

P3105.1. Distance of trap from vent. Each fixture trap shall have a protecting vent

located so that the slope and the developed length in the fixture drain from the trap weir

to the vent fitting are within the requirements in table P3105.1 of the code.

P3105.4. Vertical leg for waste fixture drains. A vertical leg (see figure P3105.4) is

permitted within a fixture drain of a waste fixture in accordance with the following

criteria:

(1) Minimum trap diameter shall be in accordance with table P3201.7 of the code.

(2) The diameter of section A shall be equal to the diameter of the trap.

(3) The length of section A shall not be less than 8 inches (2032 mm) and in

accordance with table P3105.1 of the code.

(4) The diameter of section B shall be 1 pipe size larger than the diameter of

Section A.

(5) The length of section B shall not be more than 36 inches (9144 mm).

(6) The diameter of section C shall be 1 pipe size larger than the diameter of section

B.

(7) The total length of section A and section C shall not exceed the distance allowed

in table P3105.1 of the code.

(8) Bends shall be the diameter of the largest connected section.

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History: 2001 AACS; 2004 AACS.; 2008 AACS; 2010 AACS.

R 408.30535 Connection.

Rule 535. Section P3111.2.2 of the code is amended to read as follows:

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P3111.2.2. Connection. The combination waste and vent systems shall be provided

with a dry vent connected to a point within the system or the system shall connect to a

horizontal drain that is vented in accordance with one of the methods specified in this

chapter. Combination waste and vent systems connecting to building drains receiving

only the discharge from a stack or stacks shall be provided with a dry vent. The vent

connecting the combination waste and vent pipe shall extend vertically not less than 6

inches (152 mm) above the flood level rim of the highest fixture being vented before

offsetting horizontally.

History: 2001 AACS.

R 408.30536 Electrical; general; electrical conductors; connections and electrical

grounding.

Rule 536. Sections E3401.1, E3401.2, E3401.3, E3705.4.1, E3908.8.1, and

E3908.8.2 of the code are amended and E3401.5, E3401.6, E3401.6.1, E3401.6.2,

E3401.6.3, E3401.7, and E3401.8 are added to read as follows:

E3401.1. Applicability. The provisions of chapters 34 to 43 of the code shall

establish the general scope of the electrical system and equipment requirements of the

code. Chapters 34 to 43 of the code cover those wiring methods and materials most

commonly encountered in the construction of 1- and 2-family dwellings and structures

regulated by the code. Other wiring methods, materials, and subject matter covered in

the Michigan electrical code, R 408.30801 to R 408.30880 are also allowed by the code.

E3401.2. Scope. Chapters 34 to 43 of the code shall cover the installation of

electrical systems, equipment, and components indoors and outdoors that are within the

scope of the code, including services, power distribution systems, fixtures, appliances,

devices, and appurtenances. Services within the scope of the code shall be limited to

120/240 volt, 0- to 400- ampere, single-phase systems. These chapters specifically cover

the equipment, fixtures, appliances, wiring methods, and materials that are most

commonly used in the construction or alteration of 1- and 2-family dwellings and

accessory structures regulated by the code. The omission from these chapters of any

material or method of construction provided by the Michigan electrical code, R

408.30801 to R 408.30880, shall not be construed as prohibiting the use of such material

or method of construction. Electrical systems, equipment, or components not specifically

covered in these chapters shall comply with the applicable provisions of the Michigan

electrical code, R 408.30801 to R 408.30880.

E3401.3. Not covered. Chapters 34 to 43 do not cover the following:

(1) Installations under the exclusive control of communications utilities and electric

utilities.

(2) Services over 400 amperes.

E3401.5. General. This section provides for the design, construction, installation,

alteration, and repair of photovoltaic equipment and systems. [690.1]

E3401.6. Requirements. The installation, inspection, maintenance, repair, and

replacement of photovoltaic systems and all system components shall comply with the

manufacturer’s instructions, Sections E3401.6.1 through E3401.6.3 and NFPA 70.

[690.3]

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E3401.6.1. Roof-mounted panels and modules. Where photovoltaic panels and

modules are installed on roofs, the roof shall be constructed to support the loads imposed

by such modules. Roof-mounted photovoltaic panels and modules that serve as roof

covering shall conform to the requirements for roof coverings in chapter 9. Where

mounted on or above the roof coverings, the photovoltaic panels and modules and

supporting structure shall be constructed of noncombustible materials or fire-retardant

treated wood equivalent to that required for the roof construction.

E3401.6.2. Roof and wall penetrations. Roof and wall penetrations shall be flashed

and sealed in accordance with chapter 9 to prevent entry of water, rodents, and insects.

E3401.6.3. Ground-mounted panels and modules. Ground-mounted panels and

modules shall be installed in accordance with the manufacturer’s instructions. [110.3(B)]

E3401.7. Photovoltaic panels and modules. Photovoltaic panels and modules shall

be listed and labeled in accordance with UL 1703. [690.4(B)]

E3401.8. Inverters. Inverters shall be listed and labeled in accordance with UL

1741. Systems connected to the utility grid shall use inverters listed for utility interaction.

[690.4(B)]

E3705.4.1. Conductors rated 60^◦C. Except where the equipment is marked

otherwise, termination provisions of equipment for circuits rated 100 amperes or less, or

marked for 14 AWG through 1 AWG conductors, shall be used only for 1 of the

following:

1. Conductors rated 60^◦C (140^◦F).

2. Conductors with higher temperature ratings, provided that the ampacity of such

conductors is determined based on the 60^◦C (140^◦F) ampacity of the conductor size used.

3. Conductors with higher temperature ratings where the equipment is listed and

identified for use with such conductors. [110.14(C)(1)(a)]

E3908.8.1. Grounding of flexible metal conduit. Flexible metal conduit shall not be

permitted as an equipment grounding conductor. [Michigan Electrical Code Rules Part 8

250.118 amended]

E3908.8.2. Grounding of liquid-tight flexible metal conduit. Liquid-tight flexible

metal conduit shall not be permitted as an equipment grounding conductor. [Michigan

Electrical Code Rules Part 8 250.118 amended]

History: 2001 AACS; 2004 AACS; 2008 AACS; 2010 AACS; 2015 AACS.

R 408.30536a General requirements.

Rule 536a. Sections E3402.2, E3405.2 and E3407.5 are amended to read as follows:

E3402.2. Penetrations of fire-resistance-rated assemblies. Electrical installations in

hollow spaces, vertical shafts, and ventilation or air-handling ducts shall be made so that

the possible spread of fire or products of combustion will not be substantially increased.

Electrical penetrations through fire-resistance-rated walls, partitions, floors, or ceilings

shall be protected by approved methods to maintain the fire-resistance-rating of the

element penetrated. Penetrations of fire-resistance-rated walls shall be limited as

specified in Section R302.4.

E3405.2. Working clearances for energized equipment and panelboards. Except as

otherwise specified in chapters 34 through 43, the dimension of the working space in the

direction of access to panelboards and live parts likely to require examination,

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adjustment, servicing, or maintenance while energized shall be not less than 36 inches

(914 mm) in depth. Distances shall be measured from the energized parts where such

parts are exposed or from the enclosure front or opening where such parts are enclosed.

In addition to the 36-inch dimension (914 mm), the work space shall not be less than 30

inches (762 mm) wide in front of the electrical equipment and not less than the width of

such equipment. The work space shall be clear and shall extend from the floor or

platform to a height of 6.5 feet (1 981 mm) or the height of the equipment, whichever is

greater. In all cases, the work space shall allow at least a 90-degree (1.57 rad) opening of

equipment doors or hinged panels. Equipment associated with the electrical installation

located above or below the electrical equipment shall be permitted to extend not more

than 6 inches (152 mm) beyond the front of the electrical equipment. [110.26(A)]

Exception:

1. In existing dwelling units, service equipment, and panelboards that are not rated

in excess of 200 amperes may be in spaces where the height of the working space is less

than 6.5 feet (1 981 mm), but greater than 5 feet (1 524 mm). [110.26(A)(3) Exception 1

amended]

2. Meters that are installed in meter sockets may extend beyond the other equipment.

Meter sockets shall not be exempt from the requirements of this section. [110.26(A)(3)

Exception 2]

E3407.5. Polarity of connections. No grounded conductor shall be attached to any

terminal or lead so as to reverse the designated polarity.

History: 2010 AACS; 2015 AACS.

R 408.30537 Separate outdoor electric space conditioning equipment.

Rule 537. Section E3601.6.3, E3601.6.4, and E3608.1.2.1 are added to the code and

Sections E3604.2.1, and E3609.7.1 are amended to read as follows:

E3601.6.3. Separate outdoor electric space conditioning equipment. A service

disconnect for separately metered outdoor electric space conditioning equipment shall be

grouped with the service disconnecting means for the structure or immediately adjacent

to the outdoor meter cabinet. A permanent plaque or directory shall be installed at each

service disconnect location denoting the other services, feeders, and branch circuits

supplying a building or structure and area served by each service, feeder, and branch

circuit. Grounding shall be in accordance with Sections E3607 and E3608.

E3601.6.4. Electric vehicle charging system service disconnect. A service

disconnect for electric vehicle charging systems shall be grouped with the service

disconnecting means for the structure or immediately adjacent to the outdoor meter

cabinet. A permanent plaque or directory shall be installed at each service disconnect

location identifying the other services, feeders, and branch circuits supplying a building

or structure and area served by each service, feeder, and branch circuit. Grounding shall

be in accordance with Section E3607 and E3608.

E3604.2.1. Above roofs. Conductors shall have a vertical clearance of not less than

8 feet (2438 mm) above the roof surface. The vertical clearance above the roof level

shall be maintained for a distance of not less than 3 feet (914 mm) in all directions from

the edge of the roof. See figure E3604.2.1. [230.24(A)]

Exceptions:

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1. Conductors above a roof surface subject to pedestrian traffic shall have a vertical

clearance from the roof surface in accordance with Section E3604.2.2. [230.24(A)

Exception 1]

2. Where the roof has a slope of 4 inches (102 mm) in 12 inches (305 mm) or

greater and is not accessible from an operable window, the minimum clearance shall be 3

feet (914 mm). [230.24(A) Exception 2 amended]

3. The minimum clearance above only the overhanging portion of the roof shall not

be less than 18 inches (457 mm) where not more than 6 feet (1 829 mm) of conductor

length passes over 4 feet (1 219 mm) or less of roof surface measured horizontally and

such conductors are terminated at a through-the-roof raceway or approved support.

[230.24(A) Exception 3]

4. The requirement for maintaining the vertical clearance for a distance of 3 feet

(914 mm) from the edge of the roof shall not apply to the final conductor span where the

service drop is attached to the side of a building. [230.24(A) Exception 4]

5. Where the voltage between conductors does not exceed 300 and the roof area is

guarded or isolated, a reduction in clearance to 3 feet (914 mm) shall be permitted.

[230.24(A) Exception 5]

E3608.1.2.1. Verification of the installation of the concrete encased electrode

specified for in E3608.1.2. The inspection of a concrete incased electrode meeting the

requirements of E3608.1.2 except for the connection of the grounding electrode

conductor to the electrode shall be completed by 1 of the following:

1. The electrical inspector for the enforcing agency.

2. The building inspector for the enforcing agency if all of the following conditions

are met:

a. Both the electrical and building inspectors for the enforcing agency(s) shall sign a

written agreement which shall remain on file with the enforcing agency that designates

authority to the building inspector for that agency to inspect a concrete encased electrode.

b. Upon inspection and verification by the building inspector of a concrete encased

electrode, the building inspector shall provide written documentation to the electrical

inspector that the installation of the concrete encased electrode meets the requirements set

forth in E3608.1.2. Electrode shall be ½” diameter (13mm) reinforcing bar or larger, a

minimum of 20 feet (6 096 mm) long including usual tie wire connections, and encased

in 2 inches (51 mm) of concrete except for the end of the electrode which shall be in an

accessible location and not subject to deteriorating conditions (i.e. backfill).

c. Verification of approval of the concrete encased electrode shall be made at the

construction site by signature of the field copy of the building permit noting that the

concrete encased electrode was approved along with the footing inspection or by a

readily available inspection tag attached to the accessible grounding electrode reinforcing

bar.

d. The grounding electrode conductor connection to the concrete encased electrode

shall be inspected by the electrical inspector for the enforcing agency.

E3609.7.1. Corrugated stainless steel tubing (CSST). Corrugated stainless steel

tubing gas piping systems shall be bonded to the electrical service grounding electrode

system or where provided, lightening protection electrode system. The bonding jumper

shall connect to a metallic pipe, pipe fitting, or CSST fitting between the point of delivery

and the CSST utilizing a device listed for the application. The bonding jumper shall be

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not smaller than 6 AWG copper wire or equivalent, not longer than 75 feet and

accessible. Gas piping systems that are bonded in accordance with this section shall be

considered effectively bonded regardless of the amount of CSST in the system. Any

additional grounding electrodes used shall be bonded to the electrical service grounding

electrode system, or where provided, the lighting protection grounding electrode system.

Exception: CSST piping systems tested and listed by the manufacturer for

installation without additional bonding when installed in accordance with the listing.

History: 2001 AACS; 2004 AACS; 2010 AACS; 2015 AACS.

R 408.30537a Wiring methods.

Rule 537a. Section E3803.6 and tables E3801.4, and E3802.1 are amended to read

as follows:

E3803.6. Raceway seals. Conduits or raceways shall be sealed or plugged at either

or both ends where moisture will enter and contact live parts. Sealants shall be identified

for use with the cable insulation, shield, or other components.

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Table E3801.4

ALLOWABLE APPLICATIONS FOR WIRING METHODS^{a, b, c, d, e, f, g, h, i, j, k, l}

IM

ALLOWABLE APPLICATIONS

(application allowed where marked with an “A”)

A

E

MT

E

NT

F

MC

C

RM

LFC^a

M

N

S

SE

U

C

M

R

F

SE^l

C

PV

C

Services

−

A

Aⁱ

A

Aⁱ

A

−

A

−

A

h

Feeders

A

A^b

A

b

e

Branch circuits

Inside a building

Wet locations exposed to sunlight

A

−

A

−

A

−

A

−

A^c

A

−

A

h

e

Damp locations

−

A

−

A

d

Embedded in noncinder concrete in dry location

In noncinder concrete in contact with grade

−

A

−

A

A^j

−

A^f

f

Embedded in plaster not exposed to dampness

Embedded in masonry

In masonry voids and cells exposed to dampness or

A

−

A

−

A

A^f

A

−

A

−

A

−

A

−

d

below grade line

Fished in masonry voids

In masonry voids and cells not exposed to dampness

Run exposed

Run exposed and subject to physical damage

For direct burial

A

−

A

−

A

−

A

−

A

−

A

−

A

−

A

−

A

−

A

−

A

A^g

A^f

−

A

−

A

−

A

f

For SI: 1 foot = 304.8 mm.

a. Liquid-tight flexible nonmetallic conduit without integral reinforcement within the conduit wall shall not exceed 6 feet in length.

b. Type USE cable shall not be used inside buildings.

c. The grounded conductor shall be insulated.

d. Conductors shall be a type approved for wet locations and the installation shall prevent water from entering other raceways.

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e. Shall be listed as “sunlight resistant.”

f. Metal raceways shall be protected from corrosion and approved for the application. Aluminum RMC requires approved supplementary corrosion protection.

g. RNC shall be Schedule 80.

h. Shall be listed as “sunlight resistant” where exposed to the direct rays of the sun.

i. Conduit shall not exceed 6 feet in length.

j. Liquid-tight flexible nonmetallic conduit may be encased in concrete where listed for direct burial and only straight connectors listed for use with LFNC are used.

k. In wet locations under any of the following conditions.

(i) The metallic covering is impervious to moisture.

(ii) A lead sheath or moisture-impervious jacket is provided under the metal covering.

(iii) The insulated conductors under the metallic covering are listed for use in wet locations and a corrosion-resistant jackets is provided over the metallic sheath.

l. Type USE cable not permitted above ground except to terminate at the exterior of a building in an approved enclosure and protected in accordance with Section

E3803.3.

TABLE E3802.1

GENERAL INSTALLATION AND SUPPORT REQUIREMENTS FOR WIRING METHODS^{a, b, c, d, e, f, g, h, i, j, k}

INSTALLATION REQUIREMENTS

EM

(Requirement applicable only to wiring methods marked “A”)

A

T

IM

C

RM

FM

C

LF

C

N

U

C

E

NT

M

F

P

S

M

VC

E

R^a

C

Where run parallel with the framing member or furring strip, the wiring

shall be not less than 1 ¼ inches from the edge of a furring strip or a framing

member such as a joist, rafter, or stud or shall be physically protected.

Bored holes in framing members for wiring shall be located not less than 1

¼ inches from the edge of the framing member or shall be protected with a

minimum 0.0625-inch steel plate or sleeve, a listed steel plate, or other

physical protection.

A

−

A

−

A

−

A^k

k

Where installed in grooves, to be covered by wallboard, siding, paneling,

carpeting, or similar finish, wiring methods shall be protected by 0.0625-inch-

thick steel plate, sleeve, or equivalent, a listed steel plate or by not less than 1

¼-inch free space for the full length of the groove in which the cable or

raceway is installed.

A

−

A

−

A

Securely fastened bushings or grommets shall be provided to protect

wiring run through openings in metal framing members.

−

A

−

A

−

A

−

j

The maximum number of 90-degree bends shall not exceed 4 between

junction boxes.

A

−

A

−

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Bushings shall be provided where entering a box, fitting, or enclosure

unless the box or fitting is designed to afford equivalent protection.

Ends of raceways shall be reamed to remove rough edges.

A

−

4

A

3

A

−

4

A

3

−

2

A

−

Maximum allowable on center support spacing for the wiring method in

feet.

10^l

4.5^b

b

d, l

.5^b,c

.5ⁱ

.5^e

2

Maximum support distance in inches from box or other terminations.

1

36

3

12^b,

1

3

1

−

2^{b, f}

6

2^{h, i}

6

g

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.0175 rad.

a. Installed in accordance with listing requirements.

b. Supports not required in accessible ceiling spaces between light fixtures where lengths do not exceed 6 feet.

c. Six feet for MC cable.

d. Five feet for trade sizes greater than 1 inch.

e. Two and one-half feet where used for service or outdoor feeder and 4.5 feet where used for branch circuit or indoor feeder.

f. Twenty-four inches for Type AC cable and 36 inches for interlocking Type MC cable where flexibility is necessary.

g. Where flexibility after installation is necessary, lengths of flexible metal conduit and liquidtight flexible metal conduit measured from the last point where

the raceway is securely fastened shall not exceed: 36 inches for trade sizes ½ through 1 ¼, 48 inches for trade sizes 1 ½ through 2 and 5 feet for trade sizes 2 ½

and larger.

h. Within 8 inches (203 mm) of boxes without cable clamps.

i. Flat cables shall not be stapled on edge.

j. Bushings and grommets shall remain in place and shall be listed for the purpose of cable protection.

k. See Section R502.8 and R802.7 for additional limitations on the location of bored holes in horizontal framing members.

l. Raceways may be unsupported where the raceway is not more than 900 millimeters (36 inches) long and remains in unbroken lengths (without coupling).

Such raceways shall terminate in an outlet box, junction box, device box, cabinet, or other termination at each end of the raceway.

History: 2010 AACS; 2015 AACS.

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R 408.30537b Power and lighting distribution.

Rule 537b. Sections E3901.11, E3905.3.2, E3908.9, and E3908.10, are amended and

E3908.9.1, E3908.9.1.1 and E3908.9.1.2 are added to read as follows:

E3901.11. Foyers. Foyers that are not part of a hallway in accordance with Section

E3901.10 and that have an area that is greater than 100 feet²(9.2903 m²) shall have a

receptacle(s) located in each wall space that is 3 feet (914 mm) or more in width.

Doorways, door-side windows that extend to the floor and similar openings shall not be

considered as wall space. [210.52(I) amended]

E3905.3.2. Securing to box. All permitted wiring methods shall be secured to the

boxes.

Exception: Where nonmetallic-sheathed cable is used with boxes not larger than a

nominal size of 2 ¼ inches by 4 inches (57 mm by 102 mm) mounted in walls or ceilings,

and where the cable is fastened within 8 inches (2 032 mm) of the box measured along the

sheath, and where the sheath extends through a cable knockout not less than ¼ inch (6.4

mm), securing the cable to the box shall not be required. Multiple cable entries shall be

permitted in a single cable knockout opening. [314.17(c) Exception amended]

E3908.9. Equipment fastened in place or connected by permanent wiring methods.

Noncurrent-carrying metal parts of equipment, raceways, and other enclosures, where

required to be grounded, shall be grounded by 1 of the following methods: [250.134]

(a) By any of the equipment grounding conductors permitted by Sections E3908.8 and

E3908.8.3. [250.134(A)]

(b) By an equipment grounding conductor contained within the same raceway, cable,

or cord, or otherwise run with the circuit conductors. Equipment grounding conductors

shall be identified in accordance with Section E3407.2. [250.134(B) Exception]

E3908.9.1. Cord-and-plug-connected equipment. Non-current-carrying metal parts of

the cord-and-plug-connected equipment, if grounded, shall be connected to an equipment

grounding conductor by 1 of the methods in E3908.9.1.1 and E3908.9.1.2. [250.138]

E3908.9.1.1. By means of an equipment grounding conductor. By means of an

equipment grounding conductor run with the power supply conductors in a cable assembly

or flexible cord properly terminated in a grounding-type attachment plug with 1 fixed

grounding contact. [250.138(A)]

Exception: The grounding contacting pole of grounding-type plug-in ground-fault

circuit interrupters may be of the movable, self-restoring type on circuits operating at not

over 150 volts between any 2 conductors or over 150 volts between any conductor and

ground. [250.138(A) Exception]

E3908.9.1.2. By means of a separate flexible wire or strap. By means of a separate

flexible wire or strap, insulated or bare, connected to an equipment grounding conductor,

and protected as well as practicable against physical damage, where part of the equipment.

[250.138(B)]

E3908.10. Methods of equipment grounding. Fixtures and equipment shall be

considered grounded where mechanically connected to an equipment grounding conductor

as specified in Sections E3908.8 and E3908.8.3. Wire type equipment grounding

conductors shall be sized in accordance with Section E3908.12.

History: 2010 AACS; 2015 AACS.

R 408.30537c Devices and luminaires.

Rule 537c. Sections E4002.2, and E4002.16, are amended to read as follows:

E4002.2. Grounding type. Receptacles installed on 15- and 20-ampere-rated branch

circuits shall be of the grounding type and connected to an equipment grounding conductor.

Exception: Replacement receptacles as permitted by Section E4002.16.

E4002.16. Replacements. Replacement of receptacles shall comply with the

following as applicable. [406.4(D) amended]

(1) Grounding-type receptacles. Where a grounding means exists in the receptacle

enclosure or an equipment grounding conductor is installed grounding type receptacles

shall be used and shall be connected to the equipment grounding conductor. [406.4(D)(1)

amended]

(2) Non-grounding-type receptacles. Where attachment to an equipment grounding

conductor does not exist in the receptacle enclosure, the installation shall comply with 1 of

the following: [406.4(D)(2) amended]

(a) A non-grounding-type receptacle may be replaced with another non-grounding-

type receptacle. [406.4(D)(2)(a)]

(b) A non-grounding-type receptacle may be replaced with a ground-fault circuit

interrupter-type of receptacle. These receptacles shall be marked “no equipment ground.”

An equipment grounding conductor shall not be connected from the ground-fault circuit-

interrupter-type receptacle to any outlet supplied from the ground-fault circuit-interrupter

receptacle. [406.4(D)(2)(b)]

(c) A non-grounding type receptacle may be replaced with a grounding-type

receptacle where supplied through a ground-fault circuit interrupter. Grounding-type

receptacles supplied through the ground-fault circuit interrupter shall be marked “GFCI

protected” and “no equipment ground.” An equipment grounding conductor shall not be

connected between the grounding-type receptacles. [406.4(D)(2)(c)]

(3) Ground-fault circuit interrupters. Ground-fault circuit-interrupter protected

receptacles shall be provided where replacements are made at receptacle outlets that are

required to be so protected elsewhere in this code. [406.4(D)(3)]

Exception: Where replacement of the receptacle type is impracticable, such as where

the outlet box size will not permit the installation of the GFCI receptacle, the receptacle

may be replaced with a new receptacle of the existing type, where GFCI protection is

provided and the receptacle is marked “GFCI protected” and “no equipment ground” in

accordance with E4002.16 (2)(a), (b),or (c). [406.4(D)(3) Exception]

History: 2010 AACS; 2015 AACS.

R 408.30537d Frames of ranges and clothes dryers.

Rule 537d. Section E4101.8 of the code is added to read as follows:

E4101.8. Frames of ranges and clothes dryers. Frames of electric ranges, wall-

mounted ovens, counter-mounted cooking units, clothes dryers, and outlet or junction boxes

that are part of the circuit for these appliances shall be connected to the equipment

grounding conductor in the manner specified in E3908.9. [250.140 amended]

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Exception: For existing branch-circuit installations only where an equipment

grounding conductor is not present in the outlet or junction box, the frames of electric

ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and outlet or

junction boxes that are part of the circuit for these appliances may be connected to the

grounded circuit conductor if all of the following conditions are met: [250.140 Exception]

1. The supply circuit is 120/240-volt single-phase, 3-wire connected system. [250.140

Exception (1)]

2. The grounded conductor is not smaller than 10 AWG copper or 8 AWG aluminum.

[250.140 Exception (2)]

3. The grounded conductor is insulated, or the grounded conductor is uninsulated and

part of a type SE service-entrance cable and the branch circuit originates at the service

equipment. [250.140 Exception (3)]

4. Grounding contacts of the receptacles furnished as part of the equipment are

bonded to the equipment. [250.140 Exception (4)]

History: 2015 AACS.

R 408.30538 Combustible insulation.

Rule 538. Section 302.13 of the code is amended to read as follows:

302.13. Combustible insulation. Combustible insulation shall be separated a minimum

of 3 inches (76 mm) from recessed lighting fixtures, fan motors, and other heat-producing

devices.

Exception: When heat-producing devices are listed for lesser clearances, combustible

insulation complying with the listing requirements shall be separated in accordance with

the conditions stipulated in the listing.

Recessed lighting fixtures installed in the building thermal envelope shall be installed

in accordance with the manufacturer's installation instructions.

History: 2001 AACS; 2010 AACS.

R 408.30539 Solvent cementing.

Rule 539. Section P3003.14.2 of the code is amended to read as follows:

P3003.14.2 Solvent cementing. Joint surfaces shall be clean and free from moisture.

A primer that conforms to ASTM F 656, as listed in chapter 43, shall be applied. Solvent

cement not purple in color and conforming to ASTM D 2564, CSA B137.3 or CSA B181.2,

as listed in chapter 43, shall be applied to all joint surfaces. The joint shall be made while

the cement is wet, and shall be in accordance with ASTM D 2855, as listed in chapter 43.

Solvent-cement joints shall be permitted above or below ground.

History: 2004 AACS; 2008 AACS.

R 408.30539a Automatic fire sprinkler systems.

Rule 539a. Sections R313.1, P2902.5.4 and P2904.1 of the code are amended to read

as follows:

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R313.1. Design and installation. Where installed, automatic residential fire sprinkler

systems shall conform to the design and installation requirements of the national fire

protection association (NFPA) standard 13D or P2904.1.

P2902.5.4. Connections to automatic fire sprinkler systems. The potable water supply

to automatic fire sprinkler systems shall be protected against backflow by a double check-

valve assembly or a reduced pressure principle backflow preventer.

Exception: Isolation of the water distribution system is not required for deluge,

preaction, or dry pipe system.

P2904.1. General. Where installed, residential fire sprinkler systems, or portions

thereof, shall be in accordance with NFPA 13D.

History: 2010 AACS.

R 408.30540 Elevators and platform lifts.

Rule 540. Sections R321.1, R321.2, and R321.3 of the code are amended to read as

follows:

R321.1. Elevators. Where provided, passenger elevators, limited-use/limited-

application elevators or private residence elevators shall comply with the Michigan

elevator rules R 408.7001 to R 408.8695.

R321.2. Platform lifts. Where provided, platform lifts shall comply with the Michigan

elevator rules R 408.7001 to R 408.8695.

R321.3. Accessibility. Elevators or platform lifts that are part of an accessible route

required by chapter 11 of the Michigan building code, shall comply with ICC A117.1, as

listed in chapter 44, and 1966 PA 1, MCL125.1354 to MCL 125.1356.

History: 2004 AACS; 2008 AACS; 2010 AACS.

R 408.30541a Duct Installation.

Rule 541a. Section M1502.4.2 of the code is amended to read as follows:

M1502.4.2. Duct Installation. Dryer exhaust ducts shall be supported at 4 foot (1 219

mm) intervals and secured in place. The insert end of the duct shall extend into the

adjoining duct or fitting in the direction of airflow. Ducts shall not be joined with screws or

similar fasteners that protrude into the inside of the duct.

History: 2004 AACS; 2010 AACS; 2015 AACS.

R 408.30542 Floor register location.

Rule 542. Section M1601.4.10 is added to the code to read as follows:

M1601.4.10. Floor register location. Floor registers located in room or spaces

containing water closets shall be located a minimum of 3 feet (914 mm) from the water

closet.

History: 2004 AACS; 2010 AACS; 2015 AACS.

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R 408.30543 Rescinded.

History: 2004 AACS; 2008 AACS; 2015 AACS.

R 408.30544 Light, ventilation, and heating.

Rule 544. Section R303.5.2 of the code is amended to read as follows:

R303.5.2. Exhaust openings. Outside exhaust openings shall be located as not to

create a nuisance. Exhaust openings shall not be directed onto walkways. Exhaust openings

shall not terminate within 3 feet of a ventilated section in a soffit.

History: 2004 AACS; 2008 AACS; 2010 AACS; 2015 AACS.

R 408.30544a Townhouses.

Rule 544a. Section R302.2 of the code is amended to read as follows:

R302.2. Townhouses. Each townhouse shall be considered a separate building and

shall be separated b A 2-hour fire-resistance-rated wall assembly tested in accordance with

ASTME E 119 or UL 263 with exposure from both sides.

Exception: Where the building is provided with an automatic fire sprinkler system

installed in accordance with NFPA 13D or P2904.1, a common 1-hour fire-resistance-rated

wall assembly tested in accordance with ASTM E 119 or UL 263, as listed in chapter 44, is

permitted for townhouses if such walls do not contain plumbing or mechanical equipment,

ducts, or vents in the cavity of the common wall. The wall shall be rated for fire exposure

from both sides and shall extend to and be tight against exterior walls and the underside of

the roof sheathing. Electrical installations shall be installed in accordance with chapters 34

to 43. Penetrations of electrical outlet boxes shall be in accordance with section R302.4.

History: 2010 AACS.

R 408.30544b Exterior walls.

Rule 544b. Section R302.5.1 of the code is amended and table R302.1(1) is added to

read as follows:

R302.5.1. Opening protection. Openings from a private garage directly into a room

used for sleeping purposes shall not be permitted. Other openings between the garage and

residence shall be equipped with solid wood doors not less than 1 3/8 inches (35 mm) in

thickness, solid or honeycomb-core steel doors not less than 1 3/8 inches (35 mm) thick, or

20-minute fire-rated doors.

TABLE R302.1(1)

EXTERIOR WALLS

EXTERIOR WALL ELEMENT

MINIMUM FIRE-

RESISTANCE RATING

MINIMUM FIRE

SEPARATION

DISTANCE

Walls

Fire-resistance rated

1 hour-tested in accordance

with ASTM E 119 or UL 263

< 5 feet

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with exposure from both sides

0 hours

Not fire-resistance

rated

≥ 5 feet

Not allowed^a

Fire-resistance rated

Not fire-resistance

rated

NA

1 hour on the underside

0 hours

< 2 feet

≥ 2 feet to < 5 feet

≥ 5 feet

Projections

Opening in walls

Not allowed

25% maximum of wall

area

N/A

0 hours

< 3 feet

3 feet

Unlimited

0 hours

Comply with Section R302.4

None required

5 feet

< 5 feet

5 feet

Penetrations

All

For SI: 1 foot = 304.8 mm

N/A = Not applicable

a. except as allowed as per Section R302.1 exceptions 3 and 4

History: 2004 AACS; 2010 AACS; 2015 AACS.

R 408.30544c Polyethylene plastic.

Rule 544c. Sections P2906.3.1, P2906.10.1, P3003.11.1 and P3003.12.1 of the code

are amended to read as follows:

P2906.3.1. Heat-fusion joints. Joint surfaces shall be clean and free from moisture.

Joint surfaces shall be heated to melting temperature and joined. The joint shall be

undisturbed until cool. Joints shall be made in accordance with ASTM F 2620 and the

manufacturer’s instructions.

P2906.10.1. Heat-fusion joints. Heat fusion joints for polypropylene pipe and tubing

joints shall be installed with socket-type heat-fused polypropylene fittings, butt-fusion

polypropylene fittings, or electrofusion polypropylene fittings. Joint surfaces shall be clean

and free from moisture. The joint shall be undisturbed until cool. Joints shall be made in

accordance with ASTM D 2657 and the manufacturer’s instructions.

P3003.11.1. Heat-fusion joints. Heat-fusion joints for polyolefin pipe and tubing

joints shall be installed with socket-type heat-fused polyolefin fittings or electrofusion

polyolefin fittings. Joint surfaces shall be clean and free from moisture. The joint shall be

undisturbed until cool. Joints shall be made in accordance with ASTM D 2657, ASTM F

1290, or CSA B181.3, and the manufacturer’s instructions.

P3003.12.1. Heat-fusion joints. Joint surfaces shall be clean and free from moisture.

All joint surfaces shall be cut, heated to melting temperature, and joined using tools

specifically designed for the operation. Joints shall be undisturbed until cool. Joints shall

be made in accordance with ASTM F 2620 and the manufacturer’s instructions.

History: 2015 AACS.

R 408.30545 Masonry veneer wall covering.

Rule 545. Figures R703.8, R703.8.2.1, and R703.8.2.2, of the code are amended to

read as follows:

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History: 2015 AACS.

R 408.30545a Masonry heater clearance.

Rule 545a. Section R1002.5 of the code is amended to read as follows:

R1002.5. Masonry heater clearance. Combustible materials shall not be placed within

36 inches (914 mm) of the outside surface of a masonry heater unless installed in

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accordance with NFPA 211, and the required space between the heater and combustible

material shall be fully vented to permit the free flow of air around all heater surfaces.

Exceptions:

1. When the masonry heater wall is at least 8 inches (203 mm) thick of solid masonry

and the wall of the heat exchange channels is at least 5 inches (127 mm) thick of solid

masonry, combustible materials shall not be placed within 4 inches (102 mm) of the outside

surface of a masonry heater. A clearance of at least 8 inches (203 mm) shall be provided

between the gas-tight capping slab of the heater and a combustible ceiling.

2. Masonry heaters listed and labeled in accordance with UL 1482 may be installed in

accordance with the listing specifications and the manufacturer’s written instructions.

History: 2010 AACS; 2015 AACS.

R 408.30546 Smoke alarm locations for existing buildings.

Rule 546. Sections R314.2.2, R314.3, R314.3.2, and R314.3.3, R314.4, are amended

to the code to read as follows:

R314.2.2. Alterations, repairs, and additions. When

alterations, repairs, or additions requiring a permit occur, or when 1 or more sleeping rooms

are added or created in existing dwellings, the individual dwelling unit shall be equipped

with smoke alarms located as required for new dwellings.

Exceptions:

1. Work involving the exterior surfaces of dwellings, such as the replacement of

roofing or siding, or the addition or replacement of windows or doors, or the addition of a

porch or deck, are exempt from the requirements of this section.

2. Installations, alteration, or repairs of electrical, plumbing, or mechanical systems

are exempt from the requirements of this section.

R314.3. Location. Smoke alarms shall be installed in the following locations:

1. In each sleeping room or in the immediate vicinity of the sleeping room.

2. On each additional story of the dwelling, including basements and habitable attics

and not including crawl spaces and uninhabitable attics. In dwellings or dwelling units with

split levels and without an intervening door between the adjacent levels, a smoke alarm

installed on the upper level shall suffice for the adjacent lower level provided that the lower

level is less than 1 full story below the upper level. R314.3.2. Smoke alarms in existing

buildings constructed before November 6, 1974, not undergoing an alteration, addition, or

change in occupancy requiring a building permit, shall be installed in the following

locations in each dwelling unit or sleeping unit:

(1) In each sleeping room.

(2) On each floor level including the basement level.

For sleeping units with split levels and without an intervening door between the

adjacent levels, a smoke alarm installed on the upper level shall suffice for the adjacent

lower level provided that the lower level is less than 1 full story below the upper level.

R314.3.3. Equipment requirements. The required equipment for smoke alarms

required by R314.3.2 shall consist of the following:

(1) Installation. Smoke alarm devices shall be listed and installed in accordance with

the manufacturer’s installation requirements, the provisions of the code and the provisions

of NFPA 72 as listed in chapter 44.

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(2) Power Source. The equipment shall be operable by power from 1 of the following

primary sources:

(a) The building wiring provided that such wiring is served from a commercial source

and the smoke alarm is equipped with a battery backup. Wiring shall be permanent and

without a disconnecting switch other than as required for overcurrent protection.

(b) A battery operated smoke alarm.

(c) A rechargeable battery operated smoke alarm shall be automatically recharged by

an AC circuit of the commercial light and power source.

(d) A household use alarm system with battery backup listed and approved in

accordance with the household fire warning equipment provisions of NFPA 72, as

referenced in Section R314.1 of the code.

(3) Audible alarm notification. The activation of the alarm signal shall produce a

sound that is audible in all occupiable dwelling areas.

(4) Testing and maintenance. The owner of a dwelling unit, in which required or

optional fire detection or fire protection systems equipment is installed, shall be responsible

for the proper operation, testing, and maintenance of the equipment in accordance with the

manufacturer’s instructions included with the equipment. The occupant of rental dwelling

units shall be responsible for the periodic operational testing and periodic cleaning of the

installed equipment within the rental unit in accordance with the testing instructions

provided in the manufacturer’s instructions for the equipment. If the system fails, breaks,

or is out of service, it shall be repaired and functional within 30 days.

Exception: Smoke alarms and devices installed in buildings constructed before

November 6, 1974, where an installation was approved by the appropriate enforcing agency

under regulations in effect at the time of the installation shall be considered to comply with

the provisions of the code.

R314.4. Interconnection. Where more than 1 smoke alarm is required to be installed

within an individual dwelling unit in accordance with Section R314.3, the alarm devices

shall be interconnected in such a manner that the actuation of 1 alarm will activate all of the

alarms in the individual unit. Physical interconnection of smoke alarms shall not be

required where listed wireless alarms are installed and all alarms sound upon activation of 1

alarm.

Exception: Interconnection of smoke alarms in existing areas shall not be required.

History: 2005 AACS; 2008 AACS; 2010 AACS; 2015 AACS.

Editor's Note: An obvious error in R 408.30546 was corrected at the request of the promulgating agency,

pursuant to Section 56 of 1969 PA 306, as amended by 2000 PA 262, MCL 24.256. The rule containing the

error was published in Michigan Register, 2015 MR 19. The memorandum requesting the correction was

published in Michigan Register, 2016 MR 3.

R 408.30547 Rescinded.

History: 2004 AACS; 2008 AACS; 2015 AACS.

R 408.30547a Radon Control Methods.

Rule 547a. Figure AF101 and table AF101 are amended to read as follows:

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Figure AF101. EPA map of radon zones.

Zone 1 High Potential (Greater than 4 _pCi/L^a)

Zone 2 Moderate potential (From 2 to 4 _pCi/L)

Zone 3 Low potential (Less than 2 _pCi/L)

apCi/L standard for picocuries per liter of radon gas. The U.S. environmental protection

agency (EPA) recommends that all homes that measure 4 pCi/L and greater be mitigated.

The EPA and the U.S. geological survey have evaluated the radon potential in the U.S.

and have developed a map of radon zones designed to assist building officials in deciding

whether radon resistant features are applicable in new construction.

The map assigns each of the 83 counties in Michigan to 1 of 3 zones based on radon

potential. Each zone designation reflects the average short-term radon measurement that

can be expected to be measured in a building without the implementation of radon-control

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methods. The radon zone designation of highest priority is zone 1. Table AF101 lists the

zone 1 counties illustrated on the map. More detailed information can be obtained from

state-specific booklets (EPA-402-R-93-021 through 070) available through state radon

offices or from EPA regional offices.

Figure AF101

EPA Map of Radon Zones

Table AF101

High Radon-Potential (Zone 1) Counties^a

Michigan Counties

Branch

Calhoun

Cass

Hillsdale

Jackson

Kalamazoo

Lenawee

St. Joseph

Washtenaw

a. The EPA recommends that this county listing be supplemented with other available

state and local data to further understand the radon potential of a zone 1 area.

History: 2015 AACS.

R 408.30547b Chimneys.

R547b. Sections R1003.9.1, R1005.4, Figure R1001.1, are amended and Figures

R1003.9.1(1) and R1003.9.1(2) are added to read as follows:

R1003.9.1. Chimney caps. Masonry chimneys shall have a concrete, metal, or stone

cap sloped a minimum of 10 degrees to shed water, a drip edge or slot and shall be flashed

in accordance with figure R1003.9.1(1). The joint space between the flue liner and the cap

shall be filled with compressible filler and caulked with a suitable sealant to allow for

expansion and contraction of the materials. All vertical joints in a chimney cap shall be

caulked with a suitable sealant.

The cap shall be a minimum of 2” (51 mm) thick at the outer edge and overhang the

outer wall of the chimney by a minimum of 2” (51 mm). The drip slot shall be located not

less than 1-1/2” (38 mm) from the outer surface of the chimney. A bond break shall be

installed between the concrete cap and the chimney masonry.

Metal caps shall lap down the chimney wall a minimum of 4” (102 mm) and be sealed

with a suitable sealant.

Joint sealants shall meet ASTM C 920, type S or M, grade NS, class 25 and be

installed in accordance with the manufacturer’s installation instructions.

R1005.4. Factory-built chimneys. Chimneys for use with factory-built fireplaces shall

comply with the requirements of UL 127. The metal chase cover shall be sloped a

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minimum of 10^◦to shed water. Metal chase cover shall lap down the chimney wall a

minimum of 4” (102 mm) and be sealed with a suitable sealant. Exterior wall claddings

shall be applied and flashed in accordance with Section R703 and manufacturer’s

installation instructions.

For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.

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Figure R1001.1

Fireplace and Chimney Details

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History: 2015 AACS.

R 408.30547c General.

Rule 547c. Sections N1101.3.1, N1101.7, N1101.10, N1101.12.3, N1101.16, tables

N1101.10, and N1101.10.2(2) are amended and figure N1101.10a of the code is added to

read as follows:

N1101.3.1 (R101.4.3). Additions, alterations, renovations, or repairs. Additions,

alterations, renovations, or repairs to an existing building, building system, or portion

thereof shall conform to the provisions of this code as they relate to new construction

without requiring the unaltered portion(s) of the existing building or building system to

comply with this code. Additions, alterations, renovations, or repairs shall not create an

unsafe or hazardous condition or overload existing building systems. An addition shall be

deemed to comply with this code if the addition alone complies or if the existing building

and addition comply with this code as a single building.

Exception: The following are exempt provided the energy use of the building is not

increased:

1. Storm windows installed over existing fenestration.

2. Glass only replacements in an existing sash and frame.

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3. Existing ceiling, wall, or floor cavities exposed during construction provided that

these cavities are filled with insulation.

4. Construction where the existing roof, wall, or floor cavity is not exposed.

5. Reroofing where the roof is part of the thermal envelope, and where neither the roof

sheathing nor the roof insulation is exposed.

6. Reroofing where the roof is not part of the thermal envelope.

7. Replacement of existing doors that separate conditioned space from the exterior

shall not require the installation of a vestibule or revolving door, provided, however, that an

existing vestibule that separates a conditioned space from the exterior shall not be removed.

8. Alterations that replace less than 50% of the luminaries in a space, provided that

such alterations do not increase the installed interior lighting power.

9. Alterations that replace only the bulb and ballast within the existing luminaries in a

space provided that the alteration does not increase the installed interior lighting power.

N1101.7 (R102.1.1). Above code programs. The state construction code commission

may evaluate and approve a national, state, or local energy efficiency program to exceed the

energy efficiency required by this code. Buildings approved in writing by such an energy

efficiency program, such as ICC 700-2012 “silver” or energy star version 3 (rev. 07), shall

be considered in compliance with this code. The requirements identified as “mandatory” in

chapter 4 shall be met.

N1101.10 (R301.1). Climate zones. Climate zones from figures 301.1, 301.1a or table

301.1 shall be used in determining the applicable requirements of this code.

N1101.12.3. Fenestration product rating. U-factors of fenestration products

(windows, doors, and skylights) shall be determined in accordance with NFRC 100 by an

accredited, independent laboratory, and labeled and certified by the manufacturer. Products

lacking such a labeled U-factor shall be assigned a default U-factor from table

N1101.12.3(1) or N1101.12.3(2).

Exception: Computer simulations by independent NFRC certified laboratories or

approval under section 21 of 1972 PA 230, MCL 125.1521 is considered in compliance

with this section.

N1101.16 (R401.3). Certificate (mandatory). A permanent certificate shall be posted

on or in the electrical distribution panel, and shall meet all of the following:

(a) Be affixed or attached so it does not cover or obstruct the visibility of the circuit

directory label, service disconnect label, or other required labels.

(b) Be completed by the builder or registered design professional.

(c) List the predominant R-values of insulation installed in or on ceiling/roof, walls,

foundation (slab, basement wall, crawlspace wall and/or floor) and ducts outside

conditioned spaces and U-factors for fenestration. If there is more than 1 value for each

component, then the certificate shall list the value covering the largest area.

(d) List the types and efficiencies of heating, cooling, and service water heating

equipment.

(e) If a gas-fired unvented room heater, electric furnace, or baseboard electric heater is

installed in the residence, then the certificate shall list “gas-fired unvented room heater,” as

appropriate. An efficiency shall not be listed for gas-fired unvented room heaters, electric

furnaces, or electric baseboard heaters.

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Table N1101.10

Climate Zones by County

Zones

5A

6A

7

Allegan

Barry

Bay

Berrien

Branch

Alcona

Alger

Alpena

Antrim

Baraga

Chippewa

Gogebic

Houghton

Iron

Arenac

Calhoun

Cass

Clinton

Eaton

Genesee

Gratiot

Benzie

Keweenaw

Luce

Mackinac

Ontonagon

Schoolcraft

Charlevoix

Cheboygan

Clare

Crawford

Delta

Hillsdale

Ingham

Ionia

Jackson

Kalamazoo

Kent

Dickinson

Emmet

Gladwin

Grand Traverse

Huron

Iosco

Lapeer

Isabella

Lenawee

Livingston

Macomb

Midland

Monroe

Montcalm

Muskegon

Oakland

Ottawa

Saginaw

Shiawassee

St. Clair

St. Joseph

Tuscola

Van Buren

Washtenaw

Wayne

Kalkaska

Lake

Leelanau

Manistee

Marquette

Mason

Mecosta

Menominee

Missaukee

Montmorency

Newaygo

Oceana

Ogemaw

Osceola

Oscoda

Otsego

Presque Isle

Roscommon

Sanilac

Wexford

Key: A – Moist. Absence of moisture designation indicates moisture regime is irrelevant.

Table N1101.10.2(2)

Climate Zone Definitions

Zone

Number

5A

Thermal Criteria

IP Units

SI Units

5400 < HDD65F7200

3000 < HDD18C4000

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6A

7

7200 < HDD65F9000

9000 < HDD65F12600

4000 < HDD18C5000

5000 < HDD18C7000

For SI: ºC = [(ºF)-32]/1.8

History: 2015 AACS.

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Editor's Note: An obvious error in R 408.30547c was corrected at the request of the promulgating agency,

pursuant to Section 56 of 1969 PA 306, as amended by 2000 PA 262, MCL 24.256. The rule containing the

error was published in Michigan Register, 2015 MR 19. The memorandum requesting the correction was

published in Michigan Register, 2016 MR 3.

R 408.30547d Building thermal envelope.

Rule 547d. Sections N1102.2.6, N1102.2.12, N1102.3.3, N1102.3.6, N1102.4,

N1102.4.1.1, N1102.4.1.2, N1102.4.2, N1102.4.3, N1102.4.4, tables N1102.1.1, N1102.1.3,

and N1102.4.1.1 of the code are amended to read as follows:

N1102.2.6 (R402.2.6). Steel-frame ceilings, walls, and floors. Steel-frame ceilings,

walls, and floors shall meet the insulation requirements of table N1102.2.6 or shall meet the

U-factor requirements in table N1102.1.3. The calculation of the U-factor for a steel-frame

envelope assembly shall use a series-parallel path calculation method.

N1102.2.12 Thermally isolated sunroom insulation. The minimum ceiling insulation

R-values shall be R-24 in zones 5 to 7. The minimum wall R-value shall be R-13 in all

zones. New wall or walls separating a sunroom from conditioned space shall meet the

building thermal envelope requirements.

N1102.3.3 (R402.3.3). Glazed fenestration exemption. Up to 15 square feet (1.4m²)

of glazed fenestration per dwelling unit may be exempt from U-factor requirements in

section N1102.1.1. This exemption shall not apply to the U-factor alternative approach in

section N1102.1.1 and the total UA alternative in section N1102.1.4.

N1102.3.6 (R402.3.6). Replacement fenestration. Where some or all of an existing

fenestration unit is replaced with a new fenestration product, including sash and glazing, the

replacement fenestration unit shall meet the applicable requirements for U-factor in table

N1102.1.3. Where some or all of an existing fenestration unit is replaced with a new

fenestration product, including sash and glazing, the replacement fenestration unit shall

meet the applicable requirements for U-factor in table N1102.1.1.

N1102.4 (R402.4). Air leakage. The building thermal envelope shall be constructed

to limit air leakage in accordance with the requirements of sections N1102.4.1 through

N1102.4.4.

N1102.4.1 (R402.4.1). Building thermal envelope. The building thermal envelope

shall comply with sections N1102.4.1.1 and N1102.4.1.2.

N1102.4.1.1 (R402.4.1.1). Installation (mandatory). The components of the building

thermal envelope as listed in table N1102.4.1.1 shall be installed in accordance with the

manufacturer’s instructions and the criteria listed in table N1102.4.1.1, as applicable to the

method of construction. The sealing methods between dissimilar materials shall allow for

differential expansion and contraction.

N1102.4.1.2 (R402.4.1.2). Testing (prescriptive). The building or dwelling unit shall

be tested and verified as having an air leakage rate of not exceeding 4 air changes per hour.

Testing shall be conducted with a blower door at a pressure of 0.2” w.g. (50 pascals).

Where required by the code official, testing shall be conducted by a certified independent

third party. Certification programs shall be approved by the state construction code

commission. A written report of the results of the test shall be signed by the party

conducting the test and provided to the code official. Testing shall be performed at any

time after creation of all penetrations of the building thermal envelope.

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During testing all of the following apply:

1. Exterior windows and doors, fireplace, and stove doors shall be closed, but not

sealed, beyond the intended weather stripping or other infiltration control measures.

2. Dampers including exhaust, intake, makeup air, backdraft, and flue dampers shall

be closed, but not sealed beyond intended infiltration control measures.

3. Interior doors, if installed at the time of the test, shall be open.

4. Exterior doors for continuous ventilation systems and heat recovery ventilators

shall be closed and sealed.

5. Heating and cooling systems, if installed at the time of the test, shall be turned off.

6. Supply and return registers, if installed at the time of the test, shall be fully open.

N1102.4.2 (R402.4.2). Fireplaces (mandatory). New wood-burning masonry

fireplaces shall have tight-fitting flue dampers and outdoor combustion air.

N1102.4.3 (R402.4.3). Fenestration air leakage (mandatory). Windows, skylights,

and sliding glass doors shall have an air infiltration rate of no more than 0.3 cfm per square

foot (1.5 L/s/m²), and swinging doors no more than 0.5 cfm per square foot (2.6 L/s/m²),

when tested according to NFRC 400 or AAMA/WDMA/CSA 101/I.S.2/A440 by an

accredited, independent laboratory and listed and labeled by the manufacturer.

Exception: Site-built windows, skylights, and doors.

N1102.4.4 (R402.4.4). Recessed lighting (mandatory). Recessed luminaires installed

in the building thermal envelope shall be sealed to limit air leakage between conditioned

and unconditioned spaces. All recessed luminaires shall be IC-rated and labeled as having

an air leakage rate not more than 2.0 cfm (0.944 L/s) when tested in accordance with

ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. All recessed luminaires shall be

sealed with a gasket or caulk between the housing and the interior wall or ceiling covering.

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TABLE N1102.1.1 (R402.1.1)

INSULATION AND FENESTRATION REQUIREMENTS BY COMPONENT^a

Clima

te

Zone

Fenestrati

on

Skylig

Ceili

ng

R-

Wood

Frame Wall

R-Value

Mass

Wall

Floor

R-

Value

Baseme

Slab^d

R-

Crawl

Space^c

Wall

ht^b

U-

Factor

nt^c

U-Factor^b

R-

Wall

R-Value

Value

Value^g

&

R-Value

Depth

5A

6A

7

0.32

0.55

38

49

20 or 13 +

13/17

15/20

19/21

30^e

38^e

10/13

15/19

10, 2

ft

10, 4

ft

10, 4

ft

15/19

5^f

20 or 13 +

5^f

20 or 13 +

5^f

a. R-values are minimums. U-factors are maximums. When insulation is installed in a cavity which is less than the label or design thickness of

the insulation, the installed R-value of the insulation shall not be less than the R-values specified in the table.

b. The fenestration U-factor column excludes skylights.

c. “15/19” means R-15 continuous insulation on the interior or exterior of the home or R-19 cavity insulation at the interior of the basement wall.

“15/19” may be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the

home. “10/13” means R-10 continuous insulation on the interior or exterior of the home or R-13 cavity insulation at the interior of the basement wall.

d. R-5 shall be added to the required slab edge R-values for heated slabs.

e. Or insulation sufficient to fill the framing cavity, R-19 minimum.

f. First value is cavity insulation, second is continuous insulation or insulated siding, so “13 + 5” means R-13 cavity insulation plus R-5

continuous insulation or insulated siding. If structural sheathing covers 40% or less of the exterior, continuous insulation R-value may be reduced by

no more than R-3 in the locations where structural sheathing is used – to maintain a consistent total sheathing thickness.

g. The second R-value applies when more than 1/2 the insulation is on the interior of the mass wall.

TABLE N1102.1.3 (R402.1.3)

EQUIVALENT U-FACTORS^a

Clim

ate Zone

Fenestrati

on

Skylig

ht

Ceiling

U-

Frame

Wall

Mass Wall

Floor

U-

Basemen

t

Crawl

Space

U-Factor^b

U-Factor

U-

Factor

U-Factor

Factor

Wall

Factor

U-Factor

U-

Factor

5A

6A

7

0.32

0.55

0.030

0.026

0.057

0.082

0.060

0.057

0.033

0.028

0.059

0.050

0.055

a. Nonfenestration U-factors shall be obtained from measurement, calculation, or an approved source.

b. When more than half the insulation is on the interior, the mass wall U-factors shall be a maximum of 0.065 in zone 5 and marine 4, and

0.057 in zones 6 and 7.

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TABLE N1102.4.1.1 (R402.4.1.1)

AIR BARRIER AND INSULATION INSTALLATION

COMPONENT

CRITERIA^a

Air barrier and thermal barrier

A continuous air barrier shall be installed in the building envelope.

Exterior thermal envelope contains a continuous air barrier.

Breaks or joints in the air barrier shall be sealed.

Air-permeable insulation shall not be used as a sealing material.

The air barrier in any dropped ceiling/soffit shall be aligned with the insulation and

any gaps in the air barrier sealed.

Access openings, drop down stair, or knee wall doors to unconditioned attic spaces

shall be sealed.

Ceiling/attic

Walls

Corners and headers shall be insulated and the junction of the foundation and sill

plate shall be sealed.

The junction of the top plate and top of exterior walls shall be sealed.

Exterior thermal envelope insulation for framed walls shall be installed in

substantial contact and continuous alignment with the air barrier.

Knee walls shall be sealed.

Windows, skylights, and doors

The space between window/door jambs and framing, and skylights and framing

shall be sealed.

Rim joists

Floors

Rim joists shall be insulated and include the air barrier.

Insulation shall be installed to maintain permanent contact with underside of

subfloor decking.

(including above-garage and cantilevered

floors)

The air barrier shall be installed at any exposed edge of insulation.

Where provided in lieu of floor insulation, insulation shall be permanently attached

to the crawlspace walls.

Crawl space walls

Exposed earth in unvented crawl spaces shall be covered with a class I vapor

retarder with overlapping joints taped.

Shafts, penetrations

Narrow cavities

Duct shafts, utility penetrations, and flue shafts opening to exterior or

unconditioned space shall be sealed.

Batts in narrow cavities shall be cut to fit, or narrow cavities shall be filled by

insulation that on installation readily conforms to the available cavity space.

Air sealing shall be provided between the garage and conditioned spaces.

Recessed light fixtures installed in the building thermal envelope shall be air tight,

Garage separation

Recessed lighting

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IC rated, and sealed to the drywall.

Plumbing and wiring

Batt insulation shall be cut neatly to fit around wiring and plumbing in exterior

walls, or insulation that on installation readily conforms to available space shall extend

behind piping and wiring.

Shower/tub on exterior wall

Electrical/phone box on exterior walls

HVAC register boots

Exterior walls adjacent to showers and tubs shall be insulated and the air barrier

installed separating them from the showers and tubs.

The air barrier shall be installed behind electrical or communication boxes or air-

sealed boxes shall be installed.

HVAC register boots that penetrate the building thermal envelope shall be sealed to

the subfloor or drywall.

Fireplace

An air barrier shall be installed on fireplace walls.

a. In addition, inspection of log walls shall be in accordance with the provisions of ICC-400.

History: 2015 AACS.

R 408.30547e Simulated performance alternative.

Rule 547e. Table N1105.5.2(1) [R405.5.2(1)] of the code is amended to read as follows:

TABLE N1105.5.2(1) [R405.5.2(1)]

SPECIFICATIONS FOR THE STANDARD REFERENCE AND PROPOSED DESIGNS

BUILDING

STANDARD REFERENCE DESIGN

PROPOSED DESIGN

COMPONENT

Above-grade

walls

Type: mass wall if proposed wall is mass; otherwise wood frame.

Gross area: same as proposed

U-factor: from Table N1102.1.3

Solar absorptance = 0.75

Remittance = 0.90

Type: same as proposed

Gross area: same as proposed

U-factor: from Table N1102.1.3, with insulation layer on interior side of walls.

As proposed

Basement and

crawl space walls

Above-grade

floors

Type: wood frame

As proposed

Gross area: same as proposed

U-factor: from Table N1102.1.4

Type: wood frame

Ceilings

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Gross area: same as proposed

U-factor: from Table N1102.1.4

Type: composition shingle on wood sheathing

Gross area: same as proposed

Solar absorptance = 0.75

As proposed

Roofs

Emittance = 0.90

Attics

Foundations

Type: vented with aperture = 1 ft²per 300 ft²ceiling area

Type: same as proposed foundation wall area above and below grade and soil.

Characteristics: same as proposed

As proposed

Doors

Area: 40 ft²

Orientation: North

U-factor: same as fenestration from Table N1102.1.3.

Glazing

Total^b=

(a) The proposed glazing area: where proposed glazing area is less than

of the conditioned floor area.

15%

(b) 15% of the conditioned floor area; where the proposed glazing area is 15% or

more of the conditioned floor area.

Orientation: equally distributed to four cardinal compass orientations (N, E, S &

W).

As proposed

U-factor: from Table N1102.1.4

SHGC: From Table N1102.1.2 except that for climates with no requirement (NR)

As proposed

SHGC = 0.40 shall be used.

0.92-(0.21 x SHGC as proposed)

As proposed

Interior shade fraction: 0.92-(0.21 x SHGC for the standard reference design)

External shading: none

Skylights

Thermally

None

As proposed

isolated sunrooms

Air exchange rate

Air leakage rate of 4 air changes per hour at a pressure of 0.2 inches w.g. (50 Pa).

The mechanical ventilation rate shall be in addition to the air leakage rate and the

same as in the proposed design, but no greater than 0.01 x CFA + 7.5 x (N_br+ 1)

where:

The measured air exchange rate^c.

The mechanical ventilation rate^dshall

be in addition to the air leakage rate

and shall be as proposed.

CFA = conditioned floor area

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N_br= number of bedrooms

Energy recovery shall not be assumed for mechanical ventilation.

IGain = 17,900 + 23.8 x CFA + 4104 x N_br(Btu/day per dwelling unit)

Internal gains

Internal mass

Same as standard reference

design.

An internal mass for furniture and contents of 8 pounds per square foot of floor

area.

Same as standard reference

design, plus any additional mass

specifically designed as a thermal

storage element^cbut not integral to

the building envelope or structure.

Structural mass

For masonry floor slabs, 80% of floor area covered by R-2 carpet and pad, and

20% of floor directly exposed to room air.

As proposed

For Masonry basement walls, as proposed, but with insulation required by Table

R402.1.4 located on the interior side of the walls.

For other walls, for ceilings, floors, and interior walls, wood frame construction.

Heating

As proposed for other than electric heating without a heat pump. Where the

proposed design utilizes electric heating without a heat pump the standard reference

design shall be an air source heat pump meeting the requirements of the Michigan

energy code-commercial provisions.

systems^f,g

As proposed

Capacity: sized in accordance with Section N1103.7.

As proposed

Capacity: sized in accordance with Section N1103.7.

Cooling

systems^f,h

Service water

heating^f,g,h,i

As proposed

Use: same as proposed design

Thermal

distribution systems

Untested distribution systems: DSE = 0.88

Untested distribution systems:

DSE from Table N1105.5.2(2)

Tested ducts: Leakage rate to outside conditioned space as specified Section

N1103.3.2

Tested ducts: Tested leakage rate

to outside conditioned space

Tested duct location: Unconditioned attic

Duct location: As proposed

Duct insulation: As proposed

Tested duct insulation: in accordance with Section N1103.3.1

Type: Manual, cooling temperature setpoint = 75^◦F;

Thermostat

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Heating temperature setpoint = 72^◦F

Same as standard reference

For SI: 1 square foot = 0.93 m², 1 British thermal unit = 1055 J, 1 pound per square foot = 4.88 kg/m², 1 gallon (U.S.) = 3.785 L,

^◦C = (^◦F-3)/1.8, 1 degree = 0.79 rad, 1 inch water gauge = 1250 Pa.

a. Glazing shall be defined as sunlight-transmitting fenestration, including the area of sash, curbing, or other framing elements, that enclose

conditioned space. Glazing includes the area of sunlight-transmitting fenestration assemblies in walls bounding conditioned basements. For doors

where the sunlight-transmitting opening is less than 50% of the door area, the glazing area is the sunlight transmitting opening area. For all other doors,

the glazing area is the rough frame opening area for the door including the door and the frame.

b. For residences with conditioned basements, R-2 and R-4 residences and townhouses, the following formula shall be used to determine glazing

area:

AF = A_sx FA x F

where:

AF = Total glazing area.

A_s= Standard reference design total glazing area.

FA = (Above-grade thermal boundary gross wall area)/(above-grade boundary wall area + 0.5 x below-grade boundary wall area).

F = (Above-grade thermal boundary wall area)/(above-grade thermal boundary wall area + common wall area) or 0.56, whichever is greater.

and where:

Thermal boundary wall is any wall that separates conditioned space from unconditioned space from unconditioned space or ambient conditions.

Above-grade thermal boundary wall is any thermal boundary wall component not in contact with soil.

Below-grade boundary wall is any thermal boundary wall in soil contact.

Common wall area is the area of walls shared with an adjoining dwelling unit.

L and CFA are in the same units.

c. Where required by the code official, testing shall be conducted by a certified independent third party. Hourly calculations as specified in the

ASHRAE handbook of fundamentals, or the equivalent shall be used to determine the energy loads resulting from infiltration.

d. The combined air exchange rate for infiltration and mechanical ventilation shall be determined in accordance with equation 43 of 2001

ASHRAE handbook of fundamentals, page 26.24 and the “whole-house ventilation” provisions of 2001 ASHRAE handbook of fundamentals, page

26.19 for intermittent mechanical ventilation.

e. Thermal storage element shall mean a component not part of the floors, walls, or ceilings that is part of a passive solar system, and that provides

thermal storage such as enclosed water columns, rock beds, or phase-change containers. A thermal storage element must be in the same room as

fenestration that faces within 15 degrees (0.26 rad) of true south, or must be connected to such a room with pipes or ducts that allow the element to be

actively charged.

f. For a proposed design with multiple heating, cooling, or water heating systems using different fuel types, the applicable standard reference

design system capacities and fuel types shall be weighted in accordance with their respective loads as calculated by accepted engineering practice for

each equipment and fuel type present.

g. For a proposed design without a proposed heating system, a heating system with the prevailing federal minimum efficiency shall be assumed for

both the standard reference and proposed design.

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h. For a proposed design home without a proposed cooling system, an electric air conditioner with the prevailing federal minimum efficiency shall

be assumed for both the standard reference design and the proposed design.

i. For a proposed design with a non-storage-type water heater, a 40-gallon storage-type water heater with the prevailing federal minimum energy

factor for the same fuel as the predominant heating fuel type shall be assumed. For the case of a proposed design without a proposed water heater, a 40-

gallon storage-type water heater with the prevailing federal minimum efficiency for the same fuel as the predominant heating fuel type shall be assumed

for both the proposed design and standard reference design.

History: 2015 AACS.

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R 408.30547f Systems.

Rule 547e. Sections N1103.2.1, N1103.2.2, and N1103.4.2 of the code are amended to read

as follows:

N1103.2.1. Insulation (prescriptive). All portions of the air distribution system shall be

installed in accordance with Section M1601 and be insulated to an installed R-6 when system

components are located within the building but outside the conditioned space, and R-8 when

located outside to the building thermal envelope. When located within a building envelope

assembly, at least R-8 shall be applied between the duct and that portion of the assembly farthest

from conditioned space.

Exception: Portions of the air distribution system within appliances or equipment.

N1103.2.2. Sealing (mandatory). Ducts, air handlers, and filter boxes shall be sealed. Joints

and seams shall comply with either the international mechanical code or international residential

code, as applicable.

Exceptions:

1. Air-impermeable spray foam products may be applied without additional joint seals.

2. Where a duct connection is made that is partially inaccessible, 3 screws or rivets shall be

equally spaced on the exposed portion of the joint so as to prevent a hinge effect.

3. Continuously welded and locking-type longitudinal joints and seams in ducts operating at

static pressures less than 2 inches (51 mm) of water column (500 Pa) pressure classification shall

not require additional closure systems.

Duct tightness shall be verified by either of the following:

1. Postconstruction test: Total leakage to the outside of a conditioned space or total leakage

shall be less than or equal to 4 cfm (113.3 L/min) per 100 square feet (9.29 m²) of conditioned

floor area when tested at a pressure differential of 0.1 inches (2.54 mm) w. g. (25 Pa) across the

entire system, including the manufacturer’s air handler enclosure. All register boots shall be

taped or otherwise sealed during the test.

2. Rough-in test: Total leakage shall be less than or equal to 4 cfm (113.3 L/min) per 100

square feet (9.29 m²) of conditioned floor area when tested at a pressure differential of 0.1 inches

(2.54 mm) w.g. (25 Pa) across the system, including the manufacturer’s air handler enclosure. All

registers shall be taped or otherwise sealed during the test. If the air handler is not installed at the

time of the test, total leakage shall be less than or equal to 3 cfm (85 L/min) per 100 square feet

(9.29 m²) of conditioned floor area.

Exception: The total leakage test is not required for ducts and air handlers located entirely

within the building thermal envelope.

N1103.4.2. Hot water pipe insulation (prescriptive). Insulation for hot water pipe with a

minimum thermal resistance (R-value) of R-3 shall be applied to the following:

1. Piping larger than 3/4 inch nominal diameter.

2. Piping serving more than 1 dwelling unit.

3. Piping located outside the conditioned space.

4. Piping from the water heater to a distribution manifold.

5. Piping located under a floor slab.

6. Buried piping.

7. Supply and return piping in recirculation systems other than demand recirculation

systems.

History: 2015 AACS.

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R 408.30547g Energy rating index compliance alternative.

Rule 547f. Sections N1106.1, N1106.2, N1106.3, N1106.3.1, N1106.4, N1106.5, N1106.6,

N1106.6.1, N1106.6.2, N1106.6.3, N1106.7, N1106.7.1, N1106.7.2, N1106.7.3, and table

N1106.4 of the code are added to read as follows:

N1106.1 (R406.1). Scope. This section establishes criteria for compliance using an energy

rating index (ERI) analysis.

N1106.2 (R406.2). Mandatory requirements. Compliance with this section requires that the

mandatory provisions identified in sections N1101.2 and N1103.4.2 be met. The building thermal

envelope shall be greater than or equal to levels of efficiency and solar heat gain coefficient in

table 402.1.2 or 402.1.4 of the 2009 international energy conservation code.

Exception: Supply and return ducts not completely inside the building thermal envelope

shall be insulated to a minimum of R-6.

N1106.3 (R406.3). Energy rating index. The energy rating index (ERI) shall be a numerical

integer value that is based on a linear scale constructed such that the ERI reference design has an

index value of 100 and a residential building that uses no net purchased energy has an index value

of 0. Each integer value on the scale shall represent a 1% change in the total energy use of the

rated design relative to the total energy use of the ERI reference design. The ERI shall consider

all energy used in the residential building.

N1106.3.1 (R406.3.1). ERI reference design. The ERI reference design shall be configured

such that it meets the minimum requirements of the 2006 international energy conservation code

prescriptive requirements.

The proposed residential building shall be shown to have an annual total normalized

modified load less than or equal to the annual total loads of the ERI reference design.

N1106.4 (R406.4). ERI-based compliance. Compliance based on an ERI analysis requires

that the rated design be shown to have an ERI less than or equal to the appropriate value listed in

table N1106.4 when compared to the ERI reference design.

N1106.5 (R406.5). Verification by approved agency. Verification of compliance with

section N1106 shall be completed by an approved third party.

N1106.6 (R406.6). Documentation. Documentation of the software used to determine the

ERI and the parameters for the residential building shall be in accordance with sections

N1106.6.1 through N1106.6.3.

N1106.6.1 (R406.6.1). Compliance software tools. Documentation verifying that the

methods and accuracy of the compliance software tools conform to the provisions of this section

shall be provided to the code official.

N1106.6.2 (R406.6.2). Compliance report. Compliance software tools shall generate a

report that documents that the ERI of the rated design complies with sections N1106.3 and

N1106.4. The compliance documentation shall include all of the following information:

1. Address or other identification of the residential building.

2. An inspection checklist documenting the building component characteristics of the rated

design. The inspection checklist shall show results for both the ERI reference design and the

rated design, and shall document all inputs entered by the user necessary to reproduce the results.

3. Name of individual completing the compliance report.

4. Name and version of the compliance software tool.

Exception: Multiple orientations. Where an otherwise identical building model is offered in

multiple orientations, compliance for any orientation shall be permitted by documenting that the

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building meets the performance requirements in each of the 4 (north, east, south and west)

cardinal orientations.

N1106.6.3 (R406.6.3). Additional documentation. The code official may require the

following documents:

1. Documentation of the building component characteristics of the ERI reference design.

2. A certification signed by the builder providing the building component characteristics of

the rated design.

3. Documentation of the actual values used in the software calculations for the rated design.

N1106.7 (R406.7). Calculation software tools. Calculation software, where used, shall be in

accordance with sections N1106.7.1 through N1106.7.3.

N1106.7.1 (R406.7.1). Minimum capabilities. Calculation procedures used to comply with

this section shall be software tools capable of calculating the ERI as described in section N1106.3,

and shall include the following capabilities:

1. Computer generation of the ERI reference design using only the input for the rated

design.

The calculation procedure shall not allow the user to directly modify the building component

characteristics of the ERI reference design.

2. Calculation of whole-building, as single zone, sizing for the heating and cooling

equipment in the ERI reference design residence in accordance with section N1103.7.

3. Calculations that account for the effects of indoor and outdoor temperatures and part-load

ratios on the performance of heating, ventilating, and air-conditioning equipment based on

climate and equipment sizing.

4. Printed code official inspection checklist listing each of the rated design component

characteristics determined by the analysis to provide compliance, along with their respective

performance ratings.

N1106.7.2 (R406.7.2). Specific approval. Performance analysis tools meeting the

applicable sections of section N1106 shall be approved. Tools are permitted to be approved based

on meeting a specified threshold for a jurisdiction. The code official shall approve tools for a

specified application or limited scope.

N1106.7 (R406.7.3). Input values. When calculations require input values not specified by

sections N1102, N1103, N1104, and N1105, those input values shall be taken from an approved

source.

Table N1106.4 (R406.4)

Maximum Energy Rating Index

Climate Zone

Energy Rating Index

1

2

3

4

5

6

7

8

52

51

54

55

54

53

History: 2015 AACS.

Page 83

Courtesy of Michigan Administrative Rules