5MM AD5 Reflective Foam Core Insulation, RADIANT BARRIER 24" X 20ft roll
SIZE: 2FT WIDE X 20FT LONG. WHERE TO INSULATE?. INSULATION + RADIANT BARRIER + VAPOR BARRIER + SOUND BARRIER. R-value up to 15.67 ( with one layer), up to 21.10 ( with two layers).