20 Mil HDPE/Bentonite Sheet Waterproofing and Methane-Mitigating Membrane for Blindside Installations
A sheet waterproofing and methane-mitigating membrane consisting of 20 mils of HDPE, expandable, granular bentonite and a protective layer of spun-bonded polyester. The HDPE extends beyond the bentonite on the perimeter edges to create a clean surface for seam tape installation.