Steve Smallman Property Inspections, LLC

Radon Information

Radon Information


Radon Gas Testing

Radon is a colorless, odorless, radioactive gas. The US Environmental Protection Agency (EPA) has identified radon gas as the second leading cause of lung cancer. It rises from deep in the earth through cracks in rock formations.  Radon enters buildings through openings in concrete foundation slabs or directly up through the ground in crawlspaces.

The concentration of Radon in buildings varies based on the location and the type of structure.

The EPA recommends radon testing in all residential dwellings.  EPA recommends mitigation (reduction) of Radon in a residence when the level of radioactivity associated with the gas is greater than 4.0 pCi / L. 

The most commonly used methods for testing are Activated Charcoal Canisters and Continuous Radon Monitors. They yield comparable measurements.  The Continuous Radon Monitor provides hourly measurements and warnings of potential tampering  Our fees for radon gas testing in our service area are $150 for a Continuous Radon Monitor test or $135 for a charcoal canister test.

Two Radon mitigation methods are sub-slab depressurization (for concrete slabs) and sub-membrane depressurization (for crawl spaces).  Both processes include a ventilation pipe that extends into the ground below the building with a fan that brings air up from the ground and directs the air to a location outside the building. Typical cost of these mitigation methods in North Carolina ranges from $1800 to $2,500. 

Most mitigation efforts are successful.  Radon testing is generally conducted again after a mitigation system is installed to determine its performance.