General Contractor and a Retailer

Approximately 4,500 square feet

Single day installation [approximately 12 hours]


  • Geo-Seal FILM-5 [a 5 mil cross-laminated HDPE] at base of vapor barrier
  • 30 mils of Geo-Seal CORE at center of vapor barrier
  • Geo-Seal FILM-5 at top of vapor barrier


The General Contractor needed to complete the concrete pour phase of the construction in a timely manner to stay on schedule. In order to meet these specific requirements, the vapor barrier construction would need to be finished in a single day. Furthermore, installation needed to wait until other construction tasks were completed. Therefore, there would be very little notice as to when the installation could be scheduled and executed. Due to the nature of the construction schedule and tight window the job had to be completed within, this project required a large volume of workers to stay on the job site well past the close of day in order to see it finished.


In order to address the various challenges, Vapor Mitigation Strategies coordinated and delivered an experienced certified vapor barrier installation contractor. Needing an individual with a quick response time, flexibility with rapidly developing changes in the construction schedule and a fundamental understanding of the needs of contractors to stay on time and budget, Vapor Mitigation Strategies delivered the perfect solution.


Vapor Mitigation Strategies provided its General Contractor customer a certified vapor mitigation system installation, passing both a thickness and smoke test within the single day requirement.

The work area was covered with tarps when Vapor Mitigation Strategies arrived in the morning.

While the tarps were being removed, preparatory work began on the perimeter of the vapor mitigation system.

Careful measurements were made to ensure the installation was done according to the specifications of the design and that necessary penetration from wall mounts, plumbing, electrical conduit, etc. were not interfered with as the building project moved into the next phase.

Once the pattern for the trench had been outlined, the trench was dug out to accommodate the vapor venting channel. The venting channel material was rolled into the trench, and the vapor venting channel was constructed.

Joints and bends in the venting material were made by interlocking the egg crate-shaped units on each end at 90-degree angles. In this phase of construction, the plumbing and electrical uprights were sealed, and the vapor barrier vent system uprights were installed.

Once the venting structure was finished, it was covered up by the ground material (soil, gravel, sand, etc.), completing the venting portion of the vapor barrier system.

The second portion of the vapor barrier system project involved constructing the three layer barrier. This began by applying a polypropylene tarp which was rolled out into open areas and tailored to fit around the vertical uprights. Each joint of tarp and upright cut were sealed with a Geo-Seal vapor barrier product applied either through spray or by hand. After the tarp was completely rolled out, and all uprights and edges were addressed and sealed, the main layer of Geo-Seal was sprayed over the entire tarped area.

Next, the Geo-Seal material was perforated in discrete areas near specific lines of the barrier construction for the purpose of conducting a smoke test to ensure that all the joints and uprights were properly sealed. The thickness of the layer was measured with calipers to ensure the Geo-Seal layer was applied at an appropriate thickness.

When all the perforations were sealed, and the smoke testing revealed no further leaks, a final layer of tarp was placed over the vapor barrier. Additionally, its joints and upright perforations were sealed with Geo-Seal as a final measure. This last tarp layer provides protection to the vapor barrier itself considering that in most cases, metal rebar and concrete will be layered on top as the construction moves forward.

The project required approximately 4,500 square feet of vapor barrier be installed, and that it be completed in a single day. Both of these requirements were met, ensuring the General Contractor was able to pour concrete the next day and continue with their project scope with no delays. From start to finish the process took approximately 12 hours to complete. The customer was satisfied by the craftsmanship, dedication and ability to meet the tight time demands on this particular job.