BANK – SOUTH ST. LOUIS COUNTY, MISSOURI
Approximately 4,600 square feet
Single day installation
- Geo-Seal® Spray-on Membrane Gas Vapor Barrier
- 5 mil Geo-Seal® FILM 5 (HDPE layer)
- 30 mil Geo-Seal® CORE (Spray-applied copolymer modified asphaltic membrane)
- 18 mil Geo-Seal® BASE (HDPE layer)
The prior building, a car service center, was torn down and a new structure was to be built on the existing lot. The bank elected to have a chemical vapor barrier installed because many former car service centers used fluids and chemicals that may have emitted toxic gasses into the subsurface soil vapor. Improper handling, previously unregulated disposal or accidental spills and leaks of these chemicals may have introduced them into the subsurface where they can off-gas into the soil vapor. These chemical vapors can cause air quality and health concerns for occupants of buildings directly over and adjacent to the source contamination.
Before completing construction of the new facility, which will be a bank, Vapor Mitigation Strategies installed a vapor mitigation system.
To reduce risk of exposure to vapor emanating from subsurface contamination through the concrete floor and utilities openings of the building (vapor intrusion), Vapor Mitigation Strategies mitigated any potential vapor intrusion issue and reduced the risk to human health.
Preparing the surface for rolling out tarp and removing potential penetrating materials.
Crew rolls out lowest layer of tarp and makes cut-ins around the uprights. Tarp is rolled out and put into place at the corners of the foundation.
Spraying the first layer of closure to all seams of the tarp. First layer with seams and uprights finished.
Rolling out the final tarp over the spray-applied (black) Geo-Seal material. Special attention is being shown to the boxes to ensure good seal.
More top layer being applied over sprayed Geo-Seal. Completed vapor barrier installation after thickness measurements and smoke test.