There has been much talk about Air Barriers lately and much confusion regarding them; what they are, how they are achieved and even, why bother? The answers to these questions are often not as simple as one might think, and most often, quite surprising.
The United States Department of Energy has concluded that as much as 40% of the energy needed to cool or heat a building is lost due to air leakage into and out of buildings. Structural damage due to moisture condensation in building walls has been documented. And there are increasing problems with mold growth in buildings, causing severe health risks.
These facts led to the State of Massachusetts incorporating requirements for Air Barrier systems into the Massachusetts State Energy Code for Commercial and High-Rise Residential New Construction (780 CMR 13) as of January 1, 2001. Paragraph 1304.3.1 Air Barriers states: “The building envelope shall be designed and constructed with a continuous air barrier to control air leakage into, or out of the conditioned space. An air barrier shall also be provided for interior partitions between conditioned space and space designed to maintain temperature or humidity levels which differ from those in the conditioned space.”
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