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This is a double-bubble radiant barrier: two layers of air bubbles bonded between metalized aluminum polyester film, with one side finished in black vinyl. It reflects about 97% of radiant heat and carries a Class 1/Class A fire rating from ASTM E84 testing. It is meant for attics, garages, ducts, water heaters and metal buildings where you want to block radiant heat rather than fill a cavity. Compared with fiberglass or foam board, it is thin, light and easy to staple, but it has little R-value on its own, so it works best as a radiant barrier or in combination with bulk insulation.
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Lowest price we've seen: $2.17 on Nov 12 at Amazon. Tracked across 1 store since Nov 12.
This is a double bubble reflective foil insulation roll in black. It is built from two layers of polyethylene air bubbles bonded between two layers of highly reflective metalized aluminum polyester film. One side has a waterproof black vinyl finish.
The material is lightweight yet durable and strong enough to hold staples without tearing. It does not compress, collapse or disintegrate.
It reflects 97% of radiant heat and emits less than 3%. It is a Class 1 / Class A fire rated radiant barrier that has passed the ASTM E84 and ASTM E2599 tests.
