Uploaded November 2024 | Updated September 2026, 1 hour ago

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If you live in an old house, one of your biggest priorities is probably insulating the attic, as a lot of the heat loss that occurs in a building is through the roof. But insulating an attic the wrong way can quickly lead to condensation and mold issues, and rapid degradation of the sheathing and roof structure. In this video, we are discussing insulating and air sealing attics for existing homes and buildings the right way.

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0:00 Introduction
1:24 Vented Attics
6:03 Conditioned Attics
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