Commissioning the Air Barrier System

Building enclosures should be designed and constructed to be as airtight as possible. This statement confuses many people. They ask: Shouldnt buildings breathe? Dont tight buildings make people sick? If you tighten up a building enclosure, wont you trap the interior moisture and keep it in? These questions show a lack of understanding about water vapor diffusion through building materials and its control; the buffering of moisture by building materials, and air leakage and its role in transporting moisture through the cavities of the building enclosure; and the control of air leakage using air barrier systems.

Citation: ASHRAE Journal, Vol. 47, No. 3



Product Code(s): D-24253

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