Based on polyolefin resin/chemical technology, Perminator underslab vapor barrier helps reduce the penetration of moisture and water vapor through the slab. Tough enough to withstand jobsite conditions and traffic, it won't crack, puncture, snag, split, or tear easily. After the soil has been tamped and leveled, or compacted fill has been applied, roll out the 200-ft. sheet as is or cut to size and install using the overlapping method. Perminator exceeds the requirements of the ASTM E 1745 specification. W.R. Meadows Inc. 800-342-5976.