FireHouse Energy Control ONLY installs Double-Sided HEAVYWEIGHT Perforated Aluminum Radiant Barrier Foil Insulation. Compare to our competitors. Don't be fooled by the name of the product. LOOK at the weight. Many installers sell a 14-15 pound product or a paint on product. We ONLY sell the 28-29 pound product. AtticFoil Radiant Barrier Foil: •Heavyweight Foil 28.1 Pounds per 1000 sq. foot roll •Roll Size 48" Wide. •Double Sided PERFORATED Radiant Barrier Foil. Perforated (tiny holes) allow water vapor to pass through. This foil IS NOT rated as a VAPOR BARRIER. You Usually DO NOT want a vapor barrier in attic applications. •Both Sides are the SAME. There is NO Top or Bottom. You can rest assure that The radiant barrier that firehouse energy uses is heavy duty and that once installed this product will be there for the life of your home.