After assessing of the vapor concentrations below a building and determining that a potential for vapor intrusion into a structure is realized, there are two possible paths for addressing this risk. The first is risk profiling through more sampling and analyses. The second is the installation of a mitigation facility. VMS will guide you through these two paths to develop the most cost and time-effective strategy for you.
In certain instances, risk profiling may be the lower cost solution to addressing potential VI risk. However, while it may be cost-effective, it may also be time prohibitive, requiring multiple site assessments, data analysis, reporting and consulting. These factors may greatly lengthen the time required in completing a real estate development project. This path may also lengthen the time required in solving an immediate question of safety to building occupants where VI is determined to be a potential risk.
Types of Chemical Vapor Barriers used in VI Mitigation
The second path VMS utilizes is a chemical vapor barrier that is a composite membrane system. This solution takes the advantages of chemically resistant, high-density polyethylene and combines it with the benefits of spray-applied membranes. Below the vapor resistant membrane is a venting system, which is designed for the footprint of the building. This venting system allows the chemical vapors held back from migrating into the building by the vapor membrane barrier to be vented out of the sub-slab of the building through a vent pipe and away from the building and its occupants. The combination allows VMS to offer a system that is designed specifically to mitigate contaminant vapor intrusion for new structures.
What if you are presented with the need to protect occupants in an existing building where it is infeasible to install the two-tiered chemical vapor barrier described above? VMS also provides a solution for existing structures whose sub-slab vapor is contaminated and the potential for VI has been determined. VMS can install an engineered sealant product specifically designed to repel the transmission of sub-slab vapor. This product has been rigorously tested and has proved to substantially reduce the influx of harmful vapors into an overlying building.
Our chemical vapor barriers have been accepted by state environmental agencies, branches of the military and environmental consulting firms around the world.