Low-Vapor-Permeance Under-Slab Barrier

Viper II Under-Slab Barriers help defend against water vapor and soil gas below a concrete slab. According to the maker, the multilayer vapor barrier/retarders resist punctures and tears, have low vapor permeance, and include a virgin resin in the manufacturing process that contributes to the long-term stability and durability of the material. Available in six weights from 20 to 6 mils, all Viper II products are tested to meet and exceed Class A, B, and C requirements in ASTM E 1745. The barrier is available in 14-foot-wide rolls of varying lengths. isibp.com