A radiant barrier can lower heat transfer from attics to the building below keep the attic space cooler and lower cooling costs by up to 17 in warmer climates.
Attic air barrier.
Some studies show that radiant barriers can reduce cooling costs 5 to 10 when used in a warm sunny climate.
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.
Some regions don t require a vapor barrier.
A good building will have control layers that control the flows of heat air and moisture.
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 that cause big energy losses.
Radiant barriers are utilized to reduce summer heat gain in attics and help to improve the efficiency of green building envelopes.
Hey i ve bashed fiberglass here in this blog.