Sheet Membranes for Vapor Intrusion Barrier Systems

Historically, sheet membranes used to mitigate vapor intrusion have been thick and robust geomembrane liners consisting of 60 mil High-Density Polyethene (HDPE). These robust liners were originally utilized due to their long history in landfill applications where they were subjected to aggressive leachate that forms within a landfill cell. To create tight seals, mechanical fastening was used to seal penetrations and terminate these systems to concrete surfaces.

Today, sheet membranes for vapor intrusion mitigation carry a very broad meaning. They can include 60 mil HDPE, but they may also refer to 15 mil moisture vapor barriers. Vapor barriers commonly used for water are not often designed to mitigate aggressive chemicals found on brownfield sites and often lack specific installation protocols and quality control guidelines.

EPRO offers single sheet geomembranes that innovate thin mil, single sheet membrane systems by increasing the overall thickness and strength, enhancing the seals at seams, penetrations and terminations, and providing stringent installation protocols to meet the quality control standards of the vapor intrusion mitigation industry such as smoke testing.

Simple sheet membranes are single layer (or sheet) membranes. Instead of combining multiple layers as in a composite membrane system, a sheet membrane provides a single layer of protection against vapor intrusion.

Single sheet membranes are ideal for sites that are deemed to be low risk, where concentrations are below state-specific screen levels or are large, open, flat sites where speed of installation is the ultimate deciding factor.