Polyguard Underslab MembraneBASIC USES. Underseal® Underslab Membrane is used as a waterproofing membrane/vapor barrier to virtually eliminate water and vapor transmission through concrete slabs on grade. In addition to protecting floor finishes and indoor air quality, Underslab Membrane also acts as a barrier to methane gas and radon gas.

• Creates a continuous seal underneath the concrete slab.  Forms a strong mechanical bond when the concrete, at time of pouring, intermingles with the fibers of the nonwoven geotextile.  Creates a strong adhesive bond when the static load of the concrete slab causes the sealant/adhesive compound to “cold flow” throughout all remaining voids between the fabric and the underside of the concrete slab. (See the McGraw‐Hill Dictionary of Architecture and Construction for a definition of cold flow). The Underslab System has been tested to ensure no water migration occurs between membrane and concrete  Underslab Membrane has a puncture resistance of 220 lbs., which is 64 times higher than current Class A Vapor Barrier requirements (2200 grams, or under 5 lbs). A higher puncture resistance is critical to the vapor barrier underslab system due to abuse caused by construction methods, i.e. concrete truck routes, motorized‐equipment contact with rebar during concrete applications, normal foot traffic, and regular vibration.  Features fully‐adhered, watertight laps and other details.  Acts as a barrier against toxic contaminants, including methane and radon gas, which may attempt to enter the structure through concrete cracks.  May qualify for L.E.E.D. certification via these credits: o IAQ Credit 5 ‐ Indoor Chemical and Pollutant Source Control (below‐grade toxin barrier) o SS Credit 3 ‐ Brownfield redevelopment o ID Credit 1 ‐ Innovation in design

Typical Properties

* Typical results under standard laboratory conditions.

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