Vapor Intrusion Systems | EPA Vapor Intrusion

KEEP harmful vapors

FROM ENTERING YOUR PROPERTY

A relatively new field of environmental clean up has emerged as homes and commercial building are being built near or over prior sites that may contain harmful chemicals in the soil. Abandoned waste sites, former laundry cleaning facilities, gas station and factories have in some cases been cleared to make way for new homes and businesses.

Like radon, these chemical vapors from contaminated soil and groundwater can enter into new or nearby buildings through openings in the building foundation or basement walls ─ such as cracks in the concrete slab, gaps around utility lines, and sumps. It also is possible for vapors to pass through concrete, which is naturally porous. Once inside the home or workplace, vapors may be inhaled posing immediate or long-term health risks for the occupants. In rare cases, the buildup of vapors, such as those from gasoline, may cause explosive conditions.

PASSIVE VAPOR

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The technology is much the same and can be adapted to provide both passive and active vapor intrusion mitigation systems. Many of the same techniques used in radon mitigation systems are used such as sealing openings, filling in cracks in the floor slab and gaps around pipes and utility lines found in basement or foundation walls. Concrete can be poured over unfinished dirt floors. Installing vapor barriers involves placing sheets of “geomembrane” or strong plastic beneath a building to prevent vapor entry.

Vapor Mat is used as a venting layer beneath the slab to provide a pathway for air to move beneath the floor and eventually vent through vertical evacuation pipes. Vapor barriers and matting are best installed during building construction, but can be installed in existing buildings that have crawl spaces.

active vapor

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Sub-slab depressurization involves connecting a fan to a small suction pit dug into the slab or in close proximity to the Vapor Mat in order to vent vapors outdoors.

Building over-pressurization involves adjusting the building’s heating, ventilation, and air-conditioning system to increase the pressure indoors relative to the sub-slab area. This method is typically used for office buildings and other large structures and most always comes under the purview of an HVAC contractor with experience of balancing HVAC equipment.

WORKING ON A NEW COMMERCIAL PROPERTY?

Our experienced team can help you.

Frequently Asked Questions

About vapor intrustion systems

What risks do these vapors have?

Risks will depend on the types of chemical vapors and their concentrations, how much time people spend in the building, and the building’s ventilation. Vapor concentrations will be higher indoors when windows and doors remain closed

What do mitigation methods do and who are they available for?

Mitigation methods, which lessen the effects of vapor intrusion, may be needed until contaminated soil or groundwater is cleaned up. Mitigation methods are available for both existing buildings and those planned for construction near the contaminated area.

Why should I use a vapor intrusion system?

Vapor intrusion mitigation systems are installed to reduce health risks in buildings where chemical vapors from contaminated soil and groundwater may be inhaled by indoor occupants. They also may be installed as a precaution where vapor intrusion might occur in the future. Installing a system during building construction typically is cheaper, more effective, and less disruptive than waiting until after construction. Depressurization systems offer the added benefit of reducing radon, moisture, and mold inside the building.

Why choose

radon Environmental Services

01.

Licensed

Our team is licensed with the State of Ohio.

02.

Experienced

We have been in the radon industry for over 33 years.

03.

Caring

Raising radon awareness is our #1 priority.

04.

Accredited

A+ BBB Accreditation since 2007!

05.

Guaranteed Results

We guarantee our work and the services we provide.

Radon Environmental Services was very professional and reasonable in cost. They explained the mitigation system thoroughly after it was installed. I got a quote immediately and it was installed within two weeks. They did an excellent job. I would highly recommend them.

Judy B.

Service: Mitigation