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(2015 IECC with amendments) Residential Building Code (Michigan)

Last updated: 25 February 2019
Projects shall comply with one of the following:
1. Sections R401 through R404.
2. Section R405 and the provisions of Sections R401 through R404 labelled "Mandatory."
3. An energy rating index (ERI) approach in Section R406.
Building Thermal Envelope
The building thermal envelope shall meet the requirements of Sections R402.1.1 through R402.1.5.
Specific Insulation Requirements (Prescriptive)
In addition to the requirements of Section R402.1, insulation shall meet the specific requirements of Sections R402.2.1 through R402.2.13.
Fenestration (Prescriptive)
In addition to the requirements of Section R402, fenestration shall comply with Sections R402.3.1 through R402.3.5.
Air Leakage (Mandatory)
The building thermal envelope shall be constructed to limit air leakage in accordance with the requirements of Sections R402.4.1 through R402.4.4.
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.
Service Hot Water Systems
Energy conservation measures for service hot water systems shall be in accordance with Sections R403.5.1 through R403.5.4.
Lighting Equipment (Mandatory)
Not less than 75 percent of the lamps in permanently installed lighting fixtures shall be high-efficacy lamps or not less than 75 percent of the permanently installed lighting fixtures shall contain only high-efficacy lamps.
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-percent 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.
Existing Buildings
Additions, alterations, or repairs to an existing building, building system or portion thereof shall comply with Section R502, R503 or R504. Unaltered portions of the existing building or building supply system shall not be required to comply with this code.
Except as specified in this chapter, this code shall not be used to require the removal, alteration or abandonment of, nor prevent the continued use and maintenance of, an existing building or building system lawfully in existence at the time of adoption of this code.

2015 Michigan Residential Code, Chapter 11 is based on 2015 IECC with state-specific amendments.

Amendments include but are not limited to:
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.
Table N1102.1.1/R402.1.1 Insulation and Fenestration Table amendments
Ceilings: climate zone 5 – R38 instead of R49
Wood-framed walls: climate zone 6 and 7 – R20 or R13 + 5 instead of R20 or R13 + 10 and 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.
Basement walls: climate zone 5 – R10/13 instead of R15/19
Section N1102.1.4/R402.1.4 and Table N1102.1.3/R402.1.3 U-factor Table amendments
Ceilings: climate zone 5 – 0.030 instead of 0.026
Wood-framed walls: climate zone 5 – 0.057 instead of 0.060 and climate zones 6 and 7 – 0.057 instead of 0.045
Basement walls: climate zone 5 – 0

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