Construction: code; code requirement to use air tightness testing to test a commercial building's building envelope; prohibit. Amends 1972 PA 230 (MCL 125.1501 - 125.1531) by adding sec. 4j. TIE BAR WITH: HB 6304'26

Michigan House Bill 6303 amends the state's construction code act to prohibit local enforcing agencies from requiring air tightness testing for commercial buildings. The bill specifically prevents the director of the construction code from creating rules that mandate this type of test to verify the continuity of a building's envelope. It directly affects commercial property owners and builders by removing a potential regulatory requirement for verifying how well a structure seals against air leakage. This legislation is tied to House Bill 6304 and will not take effect unless that companion bill is also enacted into law.