Air Barrier Attic

Hey i ve bashed fiberglass here in this blog.

Air barrier attic.

I put this in the air gap between my roof decking and new metal roof. Air barrier in any dropped ceiling soffit is substantially aligned with insulation and any gaps are sealed. In addition ideally all water vapor would be managed with mechanical systems. A proper air barrier reduces heat loss in winter overheating in summer and prevents moisture build up in walls which can lead to mould.

A good building will have control layers that control the flows of heat air and moisture. 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. The key to this discussion is understanding the movement of air and water vapor. Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case.

Ideally no services such as hvac distribution ducts air handlers plumbing or fire sprinkler systems should be located external to the air barrier. Radiant barrier lowest price on. 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. 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.

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. 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. My ac run time is significantly lower now dennis in tx. Air water vapor movement.

I never dreamed that it would make such a difference in the attic temperature. Some regions don t require a vapor barrier. Recessed light fixtures penetrating the thermal envelope are air tight ic rated and sealed to drywall. 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.