Air Barrier Attic

Air water vapor movement.

Air barrier attic. This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. Ideally no services such as hvac distribution ducts air handlers plumbing or fire sprinkler systems should be located external to the air barrier. Therefore an air barrier at the ceiling line such as sealed gypsum board should be present to isolate the attic space from the conditioned space. Aerobarrier is a non toxic acrylic spray that quickly and affordably seals air leaks in attics and homes we cannot overstate the importance of airtightness in homes and attic rooms.

Air barrier in any dropped ceiling soffit is substantially aligned with insulation and any gaps are sealed. I never dreamed that it would make such a difference in the attic temperature. Just because a failure in the air control layer air barrier shows up in the heat control layer insulation doesn t mean it s the fault of the insulation. In addition ideally all water vapor would be managed with mechanical systems.

This is an awesome product. In a perfect world none of the conditioned air from the house would enter the attic and none of the unconditioned air from the attic would enter the house. I put this in the air gap between my roof decking and new metal roof. A good building will have control layers that control the flows of heat air and moisture.

Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case. Hey i ve bashed fiberglass here in this blog. The key to this discussion is understanding the movement of air and water vapor. Attic access except unvented attic knee wall door or drop down stair is sealed.

Whether using loose fill or batts put the vapor barrier closest to the warm side of your installation where hot moist air would get in facing the house s interior in cold climates beneath floor insulation and the attic s interior in hot climates on top of floor insulation. Some regions don t require a vapor barrier. Exterior air barriers control infiltration of exterior air into the wall cavity and through the attic limit the ability of moist outdoor air to enter the wall cavity during the cooling season and prevent wind washing of wall insulation i e even though a house tests tight on the interior it could have a leaky exterior wall and top plate. Recessed light fixtures penetrating the thermal envelope are air tight ic rated and sealed to drywall.