DEPARTMENT OF LICENSING AND REGULATORY AFFAIRS

DIRECTOR'S OFFICE

CONSTRUCTION CODE

Filed with the secretary of state on May 1, 2025

These rules become effective 120 days after filing with the secretary of state.

(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)

R 408.30500, R 408.30501b, R 408.30505, R 408.30513, R 408.30515, R 408.30516, R 408.30518,

R 408.30519, R 408.30521a, R 408.30524, R 408.30529, R 408.30530, R 408.30532, R 408.30533,

R 408.30533a, R 408.30533b, R 408.30534, R 408.30535, R 408.30536, R 408.30539a, R

408.30541a, R 408.30544, R 408.30544b, and R 408.30547d of the Michigan Administrative Code

are amended, R 408.30533c is added, and R 408.30501a, R 408.30506, R 408.30507, R 408.30509,

R 408.30510, R 408.30510a, R 408.30521, R 408.30522a, R 408.30522b, R 408.30523, R

408.30523a, R 408.30525a, R 408.30528, R 408.30528a, R 408.30536a, R 408.30537, R

408.30537a, R 408.30537b, R 408.30537c, R 408.30537d, R 408.30538, R 408.30540, R 408.30542,

R 408.30544a, R 408.30545, R 408.30545a, R 408.30547b, R 408.30547c, R 408.30547e, R

408.30547f, and R 408.30547g are rescinded, as follows:

PART 5. RESIDENTIAL CODE

R 408.30500 Applicable code.

Rule 500. The provisions of the international residential code, 2021 edition, including appendices

AA, AB, AC, AD, AE, AF, AG, AJ, AK, AN, AO, AP, AR, and AS except for Sections R104.2,

R104.3, R104.5, R104.7, R104.8, R104.8.1, R105.3, R105.3.1, R105.3.2, R105.6, R105.9, R108.3,

R108.4, R108.5, R108.6, R109.1, R112.2, R112.3, R112.4, R113.1 to R113.3, R113.4, R114.1 to

R114.4, R313.1.1 to R313.2.1, R602.11, R602.12, N1102.3.2, tables R507.2.3, and sections M1411.8,

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, E3401.2 to E4304.5 and

AJ102.4, the IBC-2021, IECC-2021, IMC-2021, IPC-2021, NFPA 70-2023 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. ASHRAE 34-2022 edition: Designation and Safety Classification of Refrigerants

June 12, 2024

2

can be purchased at www.techstreet.com/ashrae for $178.00. The code is available for inspection and

purchase at the Department of Licensing and Regulatory Affairs, Bureau of Construction Codes, 611

West Ottawa Street, First Floor 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 $140.00 for each code

book.

R 408.30501a Rescinded.

R 408.30501b Intent.

Rule 501b. Section R101.3 of the code is 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 125.1531, takes precedence over all

provisions of this code.

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

square feet, 18.58 meters squared.

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

(iii) A retaining wall that is not more than 4 feet, 1,219 millimeters, 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 liters 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 millimeters, 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 millimeters deep, and not greater

than 5,000 gallons, 18, 925 liters, 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 millimeters, 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

meters squared, in area, that are not more than 30 inches, 762 millimeters, above grade at any point

3

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

within 36 inches, 914 millimeters, of a dwelling or its accessory structures, and do not serve any

ingress or egress door of the dwelling or its accessory structures.

(b) 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 British thermal units,

BTUs, 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) Except for a heat exchanger, replacement of any manufacturer installed part on a listed and

labeled appliance or listed and labeled equipment, if the replacement does not alter the approval of

the appliance or equipment or make the appliance or equipment unsafe.

(vi) A portable evaporative cooler.

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

refrigerant, or that are actuated by motors of 1 horsepower, 0.75 kilowatt, 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) 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 millimeters, in length and not more than 6 fittings.

(xi) 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.

(c) 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.

R 408.30506 Rescinded.

R 408.30507 Rescinded.

R 408.30509 Rescinded.

R 408.30510 Rescinded.

4

R 408.30510a Rescinded.

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.

(a) “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 millimeters, 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 millimeters, high by 24 inches, 610 millimeters, in width, or

greater, within the plane of the trusses.

(b) “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 millimeters, or where

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

assumed rectangle 42 inches, 1,063 millimeters, high by 24 inches, 610 millimeters, in width, or

greater, within the plane of the trusses.

(c) “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 and who is

registered in compliance with 2016 PA 407, MCL 339.5101 to 339.6133.

(d) “Registered design professional” means an individual who is licensed under the occupational code,

1980 PA 299, MCL 339.101 to 339.2677.

(e) "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.

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:

5

6

Table R301.2(5)P

7

Michigan Ground Snow Loads by Jurisdiction

County

Alcona

Alger

Ground Snow

Jurisdictions

All

All except:

50

70

50

35

Allegan

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

70

All

All except:

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

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

60

All

8

Berrien

Branch

50

25

20

All

All except:

township of Algansee

township of California

township of Gilead

township of Kinderhook

township of Ovid

Calhoun

25

30

All except:

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

All except:

Cass

30

50

city of Dowagiac

village of Cassopolis

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

All

All except:

9

60

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 DeTour

township of DeTour

township of Raber

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

All

Dickinson

Eaton

60

30

35

All except:

village of Mulliken

village of Sunfield

township of Sunfield

Emmet

Genesee

70

30

All

All except:

10

25

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 Blanc

township of Mundy

Gladwin

Gogebic

Grand Traverse

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

90

village of Calumet

village of Copper City

village of Lake Linden

village of Laurium

township of Calumet

township of 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 Williamston

Ionia

Iosco

Iron

35

40

60

All

11

All except:

Isabella

40

35

village of Shepherd

township of Chippewa

township of Coe

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

Lake

90

100

All except:

township of Eagle Harbor

township of Grant

township of Houghton

60

50

All except:

township of Chase

township of Cherry Valley

township of Ellsworth

township of Pinora

township of Pleasant Plains

township of Yates

Lapeer

25

All except:

12

30

village of Clifford

village of Columbiaville

village of North Branch

village of Otter Lake

township of Burlington

township of Burnside

township of Deerfield

township of Marathon

township of North Branch

township of Oregon

township of Rich

Leelanau

Lenawee

Livingston

Luce

60

20

25

70

60

70

All

Mackinac

All except:

township of Newton

township of Portage

All

All except:

township of Ewing

township of Wells

township of Republic

Macomb

Manistee

Marquette

25

60

70

60

Mason

60

40

60

35

40

All

All except:

city of Coleman

village of Sanford

township of Edenville

township of Geneva

township of Hope

township of Mills

township of Warren

Mecosta

Menominee

Midland

Missaukee

50

60

All except:

township of Bloomfield

township of Caldwell

township of Pioneer

Monroe

Montcalm

20

35

All

All except:

13

40

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

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

village of Lakewood Club

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

All

All except:

14

50

village of Hesperia

village of Walkersville

township of Colfax

township of Crystal

township of Elbridge

township of Ferry

township of Greenwood

township of Leavitt

township of Newfield

township of Otto

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

All except:

50

40

city of Evart

village of Hersey

township of Evart

township of Hersey

township of Orient

township of Osceola

township of Sylvan

All

Oscoda

Otsego

50

All except:

60

village of Elmira

village of Vanderbilt

township of Corwith

township of Elmira

township of Hayes

township of Livingston

Ottawa

50

35

All except:

township of Georgetown

township of Jamestown

township of Tallmadge

township of Zeeland

15

40

50

city of Coopersville

township of Allendale

township of Blendon

township of Chester

township of Polkton

township of Wright

Presque Isle

Roscommon

All except:

township of Bearinger

All except:

60

50

40

township of Nester

Saginaw

35

30

All except:

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

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

All

All except:

16

25

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

35

All except:

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

All except:

Washtenaw

25

17

20

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:

city of Northville

All except:

Wexford

60

50

township of Clam Lake

18

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

ICE

BARRIER

SEISMIC

DESIGN

CATEGORY

FLOOD

AIR

WIND DESIGN

Special

UNDERLAY

MENT

MEANANNUAL

TEMP^j

SUBJECT TO DAMAGE FROM

HAZARD^gFREEZING

INDEXⁱ

REQUIRED^h

Ground

Snow

Load

Speed^d

(mph)

Frost

Topographic

Windborne

Weatherin

wind

Line

Termite^c

Effects^k

debris zone^m

g^a

region^l

depth^b

Table

R301.2(4)

Figure

R318.4

See

Figure

R403.3.(2)

107

No

R301.2.2.1

Severe

42”

Yes

See Footnote^j

Footnote^g

MANUAL J DESIGN CRITERIA

Altitude

correction

Factor^e

Heating

temperature

difference

Coincident

wet bulb

Indoor winter design

dry-bulb temperature

Indoor winter design

dry bulb temperature

Outdoor winter design

dry-bulb temperature

Elevation

-

Indoor

Summer

design

relative

Humidity

Cooling

temperature

difference

Indoor Summer design

relative humidity

Indoor summer design

dry-bulb temperature

Outdoor summer design

dry-bulb temperature

Latitude

Daily range

19

-

For SI: 1 pound per square foot = 0.0479 kilopascals, 1 mile per hour = 0.447 meter /second.

(a) Where weathering requires a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of

this code, the frost line depth strength required for weathering shall govern. The weathering column shall be filled in with the

weathering index, "negligible," "moderate," or "severe" for concrete as determined from figure R301.2(1). The grade of masonry units

shall be determined from ASTM C34, ASTM C55, ASTM C62, ASTM C73, ASTM C90, ASTM C129, ASTM C145, ASTM C216,

or ASTM C652.

(b) Where the frost line depth requires deeper footings than indicated in figure R403.1(1), the frost line depth strength required for

weathering shall govern. The jurisdiction shall fill in the frost line depth column with the minimum depth of footing below finish

grade.

(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 subterranean termite 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(2). Wind

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

(e) The jurisdiction shall fill in this section of the table to establish the design criteria using table 10A from ACCA Manual J or

established criteria determined by the jurisdiction.

(f) The jurisdiction shall fill in this part of the table with the seismic design category determined from section R301.2.2.1.

(g) The jurisdiction shall fill in this part of the table with the date of the jurisdiction's entry into the National Flood Insurance

Program, which is the date of adoption of the first code or ordinance for management of flood hazard areas, and the title and date of

the currently effective Flood Insurance Study or other flood hazard study.

(h) In accordance with sections R905.1.2, R905.4.3.1, R905.5.3.1, R905.6.3.1, R905.7.3.1 and R905.8.3.1, 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 percent, value on the National Climatic Data Center data table entitled, "Air Freezing Index-USA

Method (Base 32"F)."

(j) The jurisdiction shall fill in this part of the table with the mean annual temperature from the National Climatic Data Center data

table entitled, "Air Freezing Index-USA Method (Base 32 degrees Fahrenheit)."

20

(k) In accordance with section R301.2.1.5, where there is local historical data documenting structural damage to buildings due to

topographic wind speed-up effects, the jurisdiction shall fill in this part of the table with "YES." Otherwise, the jurisdiction shall

indicate "NO" in this part of the table.

(l) In accordance with figure R301.2(2), where there is local historical data documenting unusual wind conditions, the jurisdiction shall

fill In this part of the table with "YES" and identify any specific requirements. Otherwise, the jurisdiction shall indicate "NO" in this

part of the table.

(m) In accordance with section R301.2.1.2, the jurisdiction shall indicate the wind-borne debris wind zone or zones. Otherwise, the

jurisdiction shall indicate "NO" in this part of the table.

(n) The jurisdiction shall fill in these sections of the table to establish the design criteria using table la or lb from ACCA Manual .1 or

established criteria determined by the jurisdiction.

(o) The jurisdiction shall fill in this section of the table using the Ground Snow Loads in figures R301.2(3) and R301.2(4).

21

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 millimeters, in width and 6 feet, 8 inches, 2,032 millimeters, in height.

Other exterior hinged or sliding doors shall not be less than 24 inches (6,096 millimeters)

in width and 6 feet, 6 inches, 1,981 millimeters, in height.

R311.2.1. Interior doors. Interior doors shall be not less than 24 inches, 6,096 millimeters,

in width and 6 feet, 6 inches, 1,524 millimeters, in height.

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

R 408.30519 Treads and risers.

Rule 519. Sections R311.7.5.1 and R 311.7.5.2 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

millimeters. 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 millimeters.

R311.7.5.2. Tread depth. The minimum tread depth shall be 9 inches, 229 millimeters.

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 millimeters. Winder treads shall have a minimum tread depth of 10

inches, 254 millimeters, measured as above at a point 12 inches, 305 millimeters, from

the side where the treads are narrower. Winder treads shall have a minimum tread depth

of 6 inches, 152 millimeters, at any point. Within any flight of stairs, the greatest winder

tread depth at the 12-inch, 305 millimeters, walk line shall not exceed the smallest by

more than 3/8 inch, 9.5 millimeters.

R 408.30521 Rescinded.

R 408.30521a Rooftop mounted photovoltaic panel systems.

Rule 521a. Sections R907.1, R907.2, and R907.3 of the code are added to read as follows:

R907.1. 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.

R907.2. 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.

22

R907.3. 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.

R 408.30522a Rescinded.

R 408.30522b Rescinded.

R 408.30523 Rescinded.

R408.30523a Rescinded.

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 408.31059 to R 408.31071a.

R 408.30525a Rescinded.

R 408.30528 Rescinded.

R 408.30528a Rescinded.

R 408.30529 Lining required.

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

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 millimeters, beyond or around

the rough jambs and not less than 3 inches, 76 millimeters, above finished thresholds.

Sheet-applied load bearing, bonded waterproof membranes shall be applied in accordance

with the manufacturer’s instructions.

R 408.30530 Requirements for discharge pipe.

23

Rule 530. Section P280 4.6.1 of the code is amended to read as follows:

P280 4.6.1. 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 millimeters, 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.

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 millimeters, above the roof, except that if a roof is to be used for any

purpose other than weather protection, then the vent extension shall be run not less than 7

feet, 2,134 millimeters, above the roof.

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 millimeters, in diameter. Any increase in the size of the vent

shall be made inside the building with a minimum of 1 foot, 305 millimeters, below the

roof or inside the wall.

R 408.30533a Rough plumbing.

Rule 533a. Section P2503.5.1 of the code is amended and P2503.8, P2503.8.1 and

P2503.8.2 are added 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 millimeter, 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.

24

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

square inch (psi), 34 kilopascals, or 10 inches, 254 millimeters, of mercury column, 34

kilopascals. This pressure shall be held without introduction of additional air for a period

of 15 minutes.

P2503.8 Inspection and testing of backflow prevention devices. Inspection and testing

of backflow prevention devices shall comply with sections P2503.8.1 and P2503.8.2.

P2503.8.1 Inspections. Inspections shall be made of backflow prevention assemblies to

determine whether they are operable.

P2503.8.2 Testing. Reduced pressure principle, double check, double check detector,

and pressure vacuum breaker backflow preventer assemblies shall be tested at the time

of installation and immediately after repairs or relocation.

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 millimeters, 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 millimeters, below grade.

Exception: When permitted by the code official.

R 408.30533c Pipe fittings.

Rule 533c. Section P2906.6 is added to the code to read as follows:

Pipe Fittings

MATERIAL

Acrylonitrile butadiene styrene (ABS) plastic

Cast-iron

STANDARD

ASTM D2468

ASME B16.4

ASSE 1061; ASTM D2846; ASTM F437; ASTM F438;

ASTM F439; CSA B137.6

Chlorinated polyvinyl chloride (CPVC) plastic

Copper or copper alloy

ASSE 1061; ASME B16.15; ASME B16.18; ASME B16.22;

ASME B16.26; ASME B16.51

Cross-linked polyethylene/aluminum/high-density polyethylene

(PEX-AL-HDPE)

ASTM F1986

ASSE 1061; ASTM F877; ASTM F1807; ASTM F1960;

ASTM F2080; ASTM F2098; ASTM F2159; ASTM F2434;

ASTM F2735; CSA B137.5

Fittings for cross-linked polyethylene (PEX) plastic tubing

Gray iron and ductile iron

Galvanized steel pipe

Malleable iron

AWWA C110/A21.10; AWWA C153/A21.53

ASTM A53

ASME B16.3

Insert fittings for

ASTM F1974; ASTM F1281; ASTM F1282; CSA B137.9;

CSA B137.10

Polyethylene/aluminum/polyethylene (PE-AL-PE) and cross-linked

polyethylene/aluminum/cross-linked polyethylene (PEX-AL-PEX)

Polyethylene (PE) plastic

ASTM D2609; CSA B137.1

ASTM F1807; ASTM F2098; ASTM F2159; ASTM F2735;

ASTM F2769

Fittings for polyethylene of raised temperature (PE-RT) plastic tubing

Polypropylene (PP) plastic pipe or tubing

ASTM F2389; CSA B137.11

25

ASTM D2464; ASTM D2466; ASTM D2467; CSA B137.2;

CSA B137.3

Polyvinyl chloride (PVC) plastic

Stainless steel (Type 304/304L) pipe

Stainless steel (Type 316/316L) pipe

Steel

ASTM A312; ASTM A778

ASME B16.9; ASME B16.11; ASME B16.28

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 AN 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, 2,032 millimeters, 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, 9,144 millimeters.

(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.

26

27

R 408.30535 Connection.

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

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

millimeters, above the flood level rim of the highest fixture being vented before offsetting

horizontally.

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

grounding.

Rule 536. Section E3401.1 of the code is amended to read as follows:

E3401.1. Scope. This chapter governs the electrical components, equipment and systems

used in buildings and structures covered by this code. Electrical components, equipment

and systems shall be designed and constructed in accordance with the provisions of the

Michigan electrical code, R 408.30801 to R 408.30873.

R 408.30536a Rescinded.

R 408.30537 Rescinded.

R 408.30537a Rescinded.

R 408.30537b Rescinded.

R 408.30537c Rescinded.

R 408.30537d Rescinded.

R 408.30538 Rescinded.

R 408.30539a Automatic fire sprinkler systems.

Rule 539a. Sections R313.1, R313.2, P2902.5.4 and P2904.1 of the code are amended to

read as follows:

R313.1. Townhouse automatic fire sprinkler systems. An automatic sprinkler system may

be installed in townhouses.

28

Exception: an automatic sprinkler system may not be required where additions or

alternations are made to existing townhouses that do not have an automatic sprinkler

system installed.

R313.2. One-and two-family dwellings automatic sprinkler system. An automatic

sprinkler system may be installed in one-and two-family dwellings.

Exception: An automatic sprinkler system may not be required for additions or alterations

to existing buildings that are not already provided with a sprinkler system.

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.

R 408.30540 Rescinded

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 millimeters, 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.

R 408.30542 Rescinded.

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, 914.4 millimeters, of a ventilated section in a soffit.

R 408.30544a Rescinded.

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

millimeters, in thickness, solid or honeycomb-core steel doors not less than 1-3/8 inches,

35 millimeters, thick, or 20-minute fire-rated doors.

29

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

with exposure from both sides

0 hours

< 5 feet

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 millimeters.

N/A = Not applicable

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

R 408.30545 Rescinded.

R 408.30545a Rescinded.

R 408.30547b Rescinded.

R 408.30547c Rescinded.

R 408.30547d Building thermal envelope.

Rule 547d. Section N1102.4.6 of this code is amended to read as follows:

N1102.4.6 Electrical and communication outlet boxes (air-sealed boxes). Electrical and

communication outlet boxes installed in the building thermal envelope shall be sealed to

limit air leakage between conditioned and unconditioned spaces.

R 408.30547e Rescinded.

R 408.30547f Rescinded.

30

R 408.30547g Rescinded.