Johns Manville AP Foil R 6.0, 1 in x 4 ft x 8 ft Polyisocyanurate Faced Board Insulation Electric Water Heater Hillman Double Sided House Office Key Blank Item Weight:17.637 Hillman Double Sided House Office Key Blank In addition to its compact size and cutting edge design Feet) 32 Faced Unfaced Faced Fire Resistant No Fits 2 x 4 Walls Yes Fits 2 x 6 Walls Yes For Use in Attics Yes For Use in Basements Yes For Use in Ceilings Yes For Use in Crawlspaces Yes For Use in Doors No For Use in Duct No For Use in Electrical No For Use in Floors No For Use in Garage Doors No For Use in Masonry No For Use in Plumbing No For Use in Vents No For Use in Walls Yes For Use in Windows No For Use on Glass No For Use on Insulation Yes For Use on Metal No For Use on Plastic No For Use on Wood Yes Formaldehyde Free Yes Insulation Type Polyisocyanurate Maximum R Value 6 R Value per Inch 6 Mold Resistant No Package Quantity 1 Sound Barrier No Use Location Indoor Vapor Retardant Yes Water Resistant No ENERGY STAR Certified Yes GREENGUARD Gold Certified Yes Warranty 20 year limited UNSPSC 30141500 Frequently Asked Questions (FAQ): A: Typically install the reflective foil face toward the warm air exterior and the white non‑reflective face toward the interior