Massachusetts Code Requirements for Air Barriers

There is misinformation in the article on air barriers [see EBN Vol. 17, No. 6]. Massachusetts has a requirement of 0.004 cfm/ft² @ 75 Pa for materials, not assemblies. Big difference. Massachusetts’ requirements are the same as the National Building Code of Canada. Massachusetts does not have a requirement for the airtightness of assemblies or whole buildings.

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