Paraseal® GM/LG 20 Mil Methane-Mitigating Membrane

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Paraseal® GM/LG 20 Mil

20 Mil HDPE/Bentonite Sheet Waterproofing and Methane-Mitigating Membrane for Blindside Installations

Paraseal® GM/LG 20 Mil

20 Mil HDPE/Bentonite Sheet Waterproofing and Methane-Mitigating Membrane for Blindside Installations

A sheet waterproofing and methane-mitigating membrane consisting of 20 mil 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.

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Benefits of Using Paraseal GM/LG 20 Mil in Your Next Project

Holds Strong

Spun-bonded polyester protects bentonite from being displaced during shotcrete placement

Consistent Coverage

20-mil HDPE membrane ensures uniform thickness

Seals Against Moisture Penetration

Granular bentonite expands up to 8 times its original thickness

Easy Joining

Exposed HDPE laps for tape application

Fully Compatible

With Tremco sealants, coatings and expansion joints, which is essential for tie-ins, detailing and penetrations

Methane-Mitigating

Membrane stops the passage of sub-surface methane gas vapor

Paraseal GM/LG 20 Mil Is Best For

Methane mitigation
Blindside walls
Damp and green concrete
Submerged conditions

Below slab on grade

Product Properties

Application Temperature	-25 to 130 °F (-31.7 to 54.4 °C)
ASTM D412: Elongation	500%
ASTM D5385: Resistance to Hydrostatic Head	231’ of H₂O
Thickness	20 mil

Paraseal GM/LG 20 Mil Resources

Download any of these featured resources or find a specific type of document below.

Data Sheet

Application/Installation Instruction

Architectural Specification

Product Literature

Comparing Paraseal GM/LG 20 Mil

	Paraseal® GM/LG 20 Mil	Paraseal® LG	TREMproof® Amphibia™
Applications	Blindside wall, below slab on grade	Blindside wall, backfilled wall, below slab on grade	Backfilled wall, blindside wall, below slab on grade
Chemistry	HDPE/bentonite	HDPE/bentonite	Co-extruded hybrid EPDM
Hydrocarbon Resistant?	Yes	No	No
Seam Treatment	Tape	Tape	Tape
Thickness	20 mil	20 mil	63 mil (1.6 mm)