In the third talk from “The Best of VI in ’25,” Glenn Tofani of Geokinetics/Fullterra, discusses the testing methodology he developed to determine the chemical vapor diffusion rates of barriers used to mitigate vapor intrusion into buildings. Glenn also discusses post-construction verification of mitigation systems using Radon as a surrogate.
Key points discussed:
- Three different types of QA/QC testing for vapor barriers
- Testing to evaluate chemical compatibility
- Transmission characteristics of membranes
- Measured since the 1980s
- Minimum test period is 120, some samples run for years
- Smoke testing
- A critical test to reduce the number of leaks
- Post installation testing to establish soil gas attenuation rates for the membrane
- Proper installation is critical!