Roberts 70-198 Roll of Silicone Vapor Shield Underlayment for Wood Floors, 200 sq.-Feet Convenient 33.5 in. x 72 ft., 200 sq. ft. roll For use with staple and nail down installations of solid and engineered wood floors Reduces vapor flow without trapping moisture 6 mil wet strength paper and silicone coating ensure SVS will not fall apart during installation Install with a 4 in. overlap