Hey i ve bashed fiberglass here in this blog.
Air barrier attic.
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.
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.
Attic insulation should always be installed with the paper backing facing toward the living space the ceiling in this case.
My ac run time is significantly lower now dennis in tx.
Attic access except unvented attic knee wall door or drop down stair is sealed.
This acts as a barrier to keep heated moist air from rising up into the attic during cold weather.
Some regions don t require a vapor barrier.
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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.
Air water vapor movement.
The key to this discussion is understanding the movement of air and water vapor.
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.
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.
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.