Paraseal® GM/LG – 60 mil is a sheet waterproofing and methane-mitigating membrane consisting of 60 mils of HDPE, expandable granular bentonite and a protective layer of spun-bonded polyester. The composite weight of the sheet is up to 1.5 lb/ft², creating a dual waterproofing system. The HDPE extends beyond the bentonite on the perimeter edges to create a clean surface for extruded weld or wedge weld installation.
A protection course is not required, however, drainage is always encouraged.