EXTREMELY EFFECTIVE - reflect 97% of radiant energy, perfect RADIANT BARRIER. VAPOR BARRIER - Unaffected by humidity and moisture, can be used outdoor/indoor. SUPREME QUALITY - 3mm closed cell polyethylene FOAM (not a cheap bubbles) sandwiched between PURE ALUMINUM foil on both sides. Easy to install, easy to cut, Strong but lightweight. SOUND BARRIER - excellent soundproofing material. FIRE RATE - Fire rate Class 1 / Class A, NON TOXIC - will not irritate skin, eye or throat. Non allergic. THIS IS NOT A CHEAP DOUBLE BUBBLE REFLECTIVE INSULATION, WE HAVE A SUPERIOR QUALITY REFLECTIVE FOAM CORE INSULATION, FOAM CORE RADIANT BARRIER, COMMERCIAL GRADE!!! WHERE TO INSULATE? Attics, Ceilings, Walls, Steel Buildings, POLE BARNS, Roofing, Concrete Floor, Radiant Heat in a Concrete Floor, Radiant Heating Under a Wood Floor, Cathedral Ceiling, Water Heater Tank, Radon Barrier, Water Pipe and Air Duct, Reflective Ceiling System, Behind a Hot Water Radiator, Crawl Space, In Ground Swimming Pools, Shed, Fish & Hunting Shelter, Cooling Room, Cold Chamber or Wine Cellar, Concrete Block Wall, Cavity Wall for Metallic Studs in Commercial Buildings, Foundation Wall, Above Ground Swimming Pools, Quonset Hut, House Wrap.