Frequently Asked Questions

Design FAQs

Clean Vapor and our precursor have more than 35 years of experience solving some of the most complex vapor intrusion problems in the industry. Our team of professional architects, engineers, and scientists collectively have more than 100 years of experience in the vapor intrusion business. Clean Vapor focuses on solving your vapor intrusion problem more than simply fixing your issue. CEO Tom Hatton was a technical advisor at the very first site designated as a vapor intrusion site – he literally helped develop the technology and write the standards for vapor intrusion mitigation. When you choose Clean Vapor, you are choosing a dedicated team of professionals who are committed to protecting human health, the ongoing use of the building, and you from the longer term liabilities associated with an inadequate system.

Our design team has more than 35 years of experience building Vapor Intrusion Mitigation Systems (VIMS). Of the more than 500 passive new construction designs we have created and installed not one system has ever needed to be moved to an active system because it failed to meet regulatory compliance. Clean Vapor has mitigated over 30-million square feet of both new and existing buildings. We are singularly focused on solving vapor intrusion problems and have a dedicated team of professionals who want to protect human health, the future use of the building and your long term liability.

Clean Vapor designs the best, most robust, yet energy-efficient solutions, providing potential savings during installation. Clean Vapor has witnessed lesser experienced designers specify additional or unneeded risers, or specify an improper vapor barrier, which can slow down construction when failing smoke tests which consequently drive up installation costs.

Install FAQs

Clean Vapor’s installation teams have a vast knowledge of the means and methods of both Vapor Intrusion System installation and new building construction; this enables us to be an asset to the construction schedule instead of a source of delays – as is often the case when unspecialized trades persons encounter unanticipated installation conflicts. Clean Vapor’s expertise ensures the builder will finish on schedule with the lowest risk. When we install our own designed systems, we issue a guarantee of 1 year or more for the operational efficiency of the system.

HUD projects require ANSI/AARST Standards certified professionals to perform the design and installation. For Vapor Intrusion, an Association of Vapor Intrusion Professionals (AVIP) individual is preferred. Our CEO has participated in authoring those standards and exams by which the industry must demonstrate proficiency.

We are fully insured. Clean Vapor exceeds the industry standard for insurance policy coverage. See Appendix or email Clean Vapor for full Certificate of Insurance. Coverage amounts up to: Commercial General Liability – General Aggregate $2,000,000. Excess Liability per Occurrence and Aggregate $10,000,000. .


A multi-layered Vapor Barrier provides the best protection from hazardous VOCs and puncture. Installing a multi-layered Vapor Barrier system also reduces the risk of failing QA (i.e., smoke) testing, saving delays during construction. When Clean Vapor designs your vapor barrier system as part of the complete mitigation system, our design will maximize the amount of square footage to a riser. This allows CV to have fewer risers in the building which saves money during construction.

Selecting sprayed seams for the Vapor Barrier over taping provides the best protection from hazardous VOCs and puncture. Spraying the Vapor Barriers seems also reduce the risk of failing QA (i.e., smoke) testing, saving delays during construction. Spraying seams results in reduced installation time as compared to applying two layers of tape around perimeters and protects the builder’s schedule.

One of the largest sources of contaminant exposure to the building occupants occurs when the concrete shrinks and the taped connection pulls away from the wall and soil gas contaminants are drawn into the building. This is eliminated with a spray-applied product.

Monitoring & Dynamic Controls FAQs

Most states require seasonal O&M monitoring and reports during the first year after installation, and annual reports in subsequent years. Contact Clean Vapor to find the reporting requirements in your state.

Clean Vapor’s Vapor Guardian™ products are designed to support your building and projects in attaining Environmental, Social, and Governance (ESG) goals. Most users do not know that the energy required to maintain a constant vacuum fluctuates through the year, as such, our Vapor Guardian™ ensures your system is using the minimal electricity needed to safely mitigate your building and keep vapors from intrusion into the indoor space.

Vapor Intrusion Systems are required by regulation to consistently hold a specified negative pressure beneath the slab. Frequently, client facilities experience power outages, maintenance, or operational events which can cause blowers to turn off or interrupt normal operating conditions. Telemetric monitoring provides alerts to designated persons (client, Maintenance, Vapor Dynamics team) when an alarm condition occurs, enabling active response to investigate or correct the alarm or alert condition. Without monitoring, a disabled Vapor Intrusion System may go unnoticed until the next O&M event, leaving the building inhabitants unprotected.

Let’s Work Together

We’re always looking for new opportunities and are comfortable working internationally. Please get in touch and one of our project managers will contact you about beginning the proposal process.