Viper II Platinum Under Slab Vapor Barrier Class A 14 ft x 210 ft x 8 mils priced per bundle Handi Foam® High Density is specifically Colour:Gray Handi Foam® High Density is specifically designed for applications where a high compressive strength foam is required ROXUL CAVITYROCK MD and CAVITYROCK DD are high density semi rigid board insulation products designed for external cavity wall and rainscreen applications Viper II Platinum is the first of its kind able to achieve ASTM E 1745 Class A status for blown films under 10 mils thick Viper II Platinum reduces water vapor emission transfer and moisture migration from entering the building envelope on commercial