Air Barrier Attic

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Air barrier attic.

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. A good building will have control layers that control the flows of heat air and moisture. My ac run time is significantly lower now dennis in tx. Hey i ve bashed fiberglass here in this blog.

Air water vapor movement. Ideally no services such as hvac distribution ducts air handlers plumbing or fire sprinkler systems should be located external to the air barrier. This is an awesome product. Recessed light fixtures penetrating the thermal envelope are air tight ic rated and sealed to drywall.

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. Air barrier in any dropped ceiling soffit is substantially aligned with insulation and any gaps are sealed. This acts as a barrier to keep heated moist air from rising up into the attic during cold weather. 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.

A proper air barrier reduces heat loss in winter overheating in summer and prevents moisture build up in walls which can lead to mould. Attic access except unvented attic knee wall door or drop down stair is sealed. 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. 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.

The key to this discussion is understanding the movement of air and water vapor. In addition ideally all water vapor would be managed with mechanical systems. 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 put this in the air gap between my roof decking and new metal roof.