EXTREMELY EFFECTIVE - R value up to 15.32 (with one layer), up to 20.42 (with two layers), reflect 97% of radiant energy, perfect radiant barrier! REFLECTIVE SURFACE - Metalized Film Water Proof (Indoor / Outdoor) VAPOR BARRIER -Unaffected by humidity and moisture can be used outdoor/indoor! FOAM, NOT A BUBBLES- very easy to work with, will sealed the holes from staples or screws itself, will not lose a 3mm thickness over the time. FIRE RATE - Fire rate Class 1 / Class A, NON TOXIC - will not irritate skin, eye or throat. Non allergic. EASY TO WORK WITH - Easy to install, easy to cut and easy to clean, Strong but lightweight. AD3 Thickness (3MM) Additional Details ------------------------------ Bullet point: Highly Reflective Double Sided Radiant Barrier with a closed-cell foam core insulation. (not cheap bubble) Industrialized strength, lightweight yet durable insulation designed to hold staples without tearing. Does not compress, collapse or disintegrate. Reflects 97% of radiant heat, emits less than 3% of heat, ASTM Class 1 / Class A fire rated radiant barrier that has passed the ASTM E84 test ASTM E2599 Product description: EXTREMELY EFFECTIVE - R value up to 15.32 (with one layer), up to 20.42 (with two layers), reflect 97% of radiant energy, perfect radiant barrier! REFLECTIVE SURFACE - Metalized Film Water Proof (Indoor / Outdoor) VAPOR BARRIER -Unaffected by humidity and moisture can be used outdoor/indoor! FOAM, NOT A BUBBLES- very easy to work with, will sealed the holes from staples or screws itself, will not lose a 3mm thickness over the time. FIRE RATE - Fire rate Class 1 / Class A, NON TOXIC - will not irritate skin, eye or throat. Non allergic. EASY TO WORK WITH - Easy to install, easy to cut and easy to clean, Strong but lightweight. AD3 Thickness (3MM)