Air Barrier Attic

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.

Air barrier attic.

This is an awesome product. 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. Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case. In addition ideally all water vapor would be managed with mechanical systems.

A good building will have control layers that control the flows of heat air and moisture. This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. Recessed light fixtures penetrating the thermal envelope are air tight ic rated and sealed to drywall. Attic access except unvented attic knee wall door or drop down stair is sealed.

Ideally no services such as hvac distribution ducts air handlers plumbing or fire sprinkler systems should be located external to the air barrier. 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. I put this in the air gap between my roof decking and new metal roof. 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.

I never dreamed that it would make such a difference in the attic temperature. 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. Radiant barrier lowest price on. My ac run time is significantly lower now dennis in tx.

The key to this discussion is understanding the movement of air and water vapor. Air barrier in any dropped ceiling soffit is substantially aligned with insulation and any gaps are sealed. 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. Hey i ve bashed fiberglass here in this blog.