• Vapor Retarder
• Class A of ASTM E 1745
• Roll Size: 14' x 140' = 1960 ft2
• Permeance: 0.0067 perms
• Puncture: 3005 grams
• Tensile: 66.7 lb f/ in

Viper® II is a multi-layer, extruded, HD virgin polyolefin membrane designed to act as a vapor/moisture barrier underneath concrete slabs. It comes in three varieties and offers premium protection against soil gas and moisture diffusion through the slab.

WHY IS A VAPOR BARRIER NECCESSARY UNDER CONCRETE?
Concrete is a naturally porous material. Without a vapor barrier, air pressure can cause soil gasses and water vapor to migrate through the slab into a home or building. In some instances, methane and radon levels in basements have risen high enough to be fatal. Moisture has been know to cause mold, mildew, fungus, rust stains, odors, floor failure and more.

HOW DOES VIPER® VAPORCHECK® HELP?
When installed beneath the concrete slab, Viper® II creates a barrier between the concrete and the soil that is virtually impervious to soil gasses and moisture. Methane, radon, and water vapor are stopped short of migrating through the slab and kept from creating problems inside the building.

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