Bentonite Geotextile Sheet Waterproofing Membrane
Mapeproof HW waterproofing membrane is composed of sodium bentonite encapsulated between two polypropylene geotextile fabrics – a nonwoven and a woven fabric – at a rate of 1.13 lbs. per sq. ft. (5,5 kg per m2). The nonwoven fabric is needlepunched through to the woven fabric, with thousands of fibers mechanically locking the sodium bentonite clay in place. After backfill is placed and confined under pressure, Mapeproof HW hydrates and forms a monolithic waterproofing membrane when exposed to moisture. Mapeproof HW contains zero VOCs and can be installed in most weather conditions as well as to green concrete.
The swelling characteristics of the sodium bentonite clay in Mapeproof HW can seal small concrete cracks caused by ground settlement, concrete shrinkage or seismic action. Mapeproof HW also forms a strong mechanical bond to concrete when the concrete is poured onto the nonwoven geotextile fibers.