UNISON 1,500 sq. ft. roll, 375 ft. x 4 ft. x 3/32 in., 2-in-1 Underlayment for Laminate and Engineered Wood Flooring 1,500 sq. ft. coverage with roll measuring 375 ft. x 4 ft. x 3/32 in To be used for wood subfloors Can also be used with concrete slabs with recommended Moisture Barricade (Item# 70-115, sold separately) Has a heat flow resistance R-Value of 0.29 Offers cushioning, sound reduction, moisture resistance and levels minor subfloor imperfections