The maximum air leakage rate for all new homes is 5.0 ACH50 – an amendment of the 2015 IECC of 3.0 ACH50 made by the UCC Review & Advisory Council (RAC). The new code requires homes to be tighter than the 7.0 ACH50 under 2009 IECC testing. Pennsylvania’s maximum air leakage rate is a mandatory requirement, meaning it is a hard cap for all compliance paths, with no tradeoffs allowed. The prescriptive air barrier and insulation installation criteria are also required for every home.

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