Mich. Admin. Code R. 408.30547c - [Rescinded effective 8/29/2025] General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.

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.

Table N1101.10

Climate Zones by County

Zones
5A	6A	7
Allegan	Alcona	Baraga
Barry	Alger	Chippewa
Bay	Alpena	Gogebic
Berrien	Antrim	Houghton
Branch	Arenac	Iron
Calhoun	Benzie	Keweenaw
Cass	Charlevoix	Luce
Clinton	Cheboygan	Mackinac
Eaton	Clare	Ontonagon
Genesee	Crawford	Schoolcraft
Gratiot	Delta
Hillsdale	Dickinson
Ingham	Emmet
Ionia	Gladwin
Jackson	Grand Traverse
Kalamazoo	Huron
Kent	Iosco
Lapeer	Isabella
Lenawee	Kalkaska
Livingston	Lake
Macomb	Leelanau
Midland	Manistee
Monroe	Marquette
Montcalm	Mason
Muskegon	Mecosta
Oakland	Menominee
Ottawa	Missaukee
Saginaw	Montmorency
Shiawassee	Newaygo
St. Clair	Oceana
St. Joseph	Ogemaw
Tuscola	Osceola
Van Buren	Oscoda
Washtenaw	Otsego
Wayne	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	Thermal Criteria
	IP Units	SI Units
5A	5400 < HDD65°F<=7200	3000 < HDD18°F<=4000
6A	7200 < HDD65°F<=9000	4000 < HDD18°F<=5000
7	9000 < HDD65°F<=12600	5000 < HDD18°F<=7000

For SI: ºC = [(ºF)-32]/1.8

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Notes

Mich. Admin. Code R. 408.30547c

2015 AACS; 2025 MR 10, Eff. 8/29/2025