Michigan Administrative Code › Department - Licensing and Regulatory Affairs › Bureau of Construction Codes › Construction Code Commission General Rules › Construction Code › Part 5 - RESIDENTIAL CODE › Section R. 408.30547d - Building thermal envelope

Current through Vol. 24-12, July 15, 2024
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 manufacturers 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.
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.