GTM General Contracting, Inc.                      704-617-6349                                                                
Serving the Charlotte, NC Area
                                                                                        
                                                                       


Radon Remediation

If a test in your home or building reveals radon levels at or above the EPA corrective action level of 4.0pCi/L, remediation is recommended.  Below you will find a description of the radon remediation methods that we most commonly use.
ERV  / Ventilation
Ventilation and Air Exchange are common methods of radon remediation typically used on homes, condominiums, and offices that have high radon levels as a result of emanation from building materials.  Energy Recovery Ventilators (ERV) are an effective ventilation system used on individual condominium units, homes, and offices.  Large HVAC conditioned ventilation systems are used when remediating an entire commercial building.  All ventilation systems must operate continuously.


Crawlspace Membrane Depressurization System

This radon remediation system is used when the home or commercial building has a crawlspace. The crawlspace is encapsulated with a radon retarder membrane is used to cover the dirt in the entire crawlspace.  The membrane runs up the walls and piers and is mechanically fastened and sealed with mastic to make the entire membrane gas tight.  A PVC pipe that connects to an exterior blower and exhaust pipe is then installed under the gas tight membrane to reduce the radon level below the action level set by the US EPA.


Radon Testing
Every residential and commercial building should be tested for high levels of radon.  There are different devices that are used for short term and long term testing.  See the examples below.
Continuous Radon Monitor
Used for short term or long term radon testing
Charcoal Testing Device
2 - 7 Day Radon Testing Device
Alpha Trak Testing Device
90+ days Long Term Testing Device

Vapor Intrusion
Vapor Intrusion exists when volatile or semi-volatile chemicals in the soil and groundwater migrate into homes and buildings.  Chemical vapors entering a building can cause acute and/or chronic health issues.  Contaminated sites include dry cleaning operations, gasoline stations, industrial and manufacturing facilities, and Brownfield sites just to name a few.  Vapor Intrusion doesn't just occur on the contaminated site.  The contaminants can spread to adjacent properties via groundwater transport.
Mitigating vapor contaminated buildings is typically achieved by depressurizing the soil under the concrete slab.  Extensive diagnostic testing is necessary to determine the mitigation system design.