Ceiling Vapor Barrier May 6, 2013/in Attics /by adminAny penetration to the needs to be sealed and properly vented out through the roof. Even seemingly harmless penetrations like this built-in vacuum exhaust need to be vented outside as they are a source of warm, moist air. https://idealinsulation.com/wp-content/uploads/2016/12/ideal_logo.png 0 0 admin https://idealinsulation.com/wp-content/uploads/2016/12/ideal_logo.png admin2013-05-06 19:14:272013-07-04 13:43:35Ceiling Vapor Barrier