Paraseal® GM Sheet Applied Waterproofing

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Paraseal® GM

HDPE/Bentonite Sheet Waterproofing and Methane-Mitigating Membrane

Paraseal® GM

HDPE/Bentonite Sheet Waterproofing and Methane-Mitigating Membrane

A sheet waterproofing and methane-mitigating membrane consisting of 20 mil of HDPE and expandable, granular bentonite. The HDPE extends beyond the bentonite on the perimeter edges to create a clean surface for seam tape installation.

Download Data Sheet Download Application Instructions Find a Rep or Distributor

Benefits of Using Paraseal GM in Your Next Project

Fast Installation

Can be installed over damp and green concrete

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 Is Best For

Methane mitigation
Backfilled walls
Damp and green concrete
Split slab

Submerged conditions

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
Seam Treatment	Tape
Thickness	20 mil

Paraseal GM Resources

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

Paraseal GM Data Sheet

Paraseal Backfilled Wall Application Instructions

Section 07 17 00 Dual/HDPE Paraseal GM

Waterproofing and Drainage Product Selector Guide

Comparing Paraseal GM

	Paraseal® GM	Paraseal® GM/LG 20 Mil	Paraseal® LG	TREMproof® Amphibia™
Chemistry	HDPE/bentonite	HDPE/bentonite	HDPE/bentonite	Co-extruded hybrid EPDM
Hydrocarbon Resistant?	Yes	Yes	No	No
Seam Treatment	Tape	Tape	Tape	Tape
Thickness	20 mil	20 mil	20 mil	63 mil (1.6 mm)