IAQ5: If in EPA Radon Zone 1, install a passive radon/soil gas vent system to exterior and label it clearly

Purpose

Radon is a naturally occurring radioactive gas that is present in the ground at varying concentrations across the country. It has been identified as one of the major causes of lung cancer, and homes susceptible to radon gases should be designed to prevent its entry into the home. This is accomplished through complete air sealing and venting of soil gases to separate the ground from the conditioned space.

Criteria

Required only if home is located in Radon zone 1, as defined by EPA Map of Radon Zones. The passive radon vent shall be installed to vent soil gases through the roof and shall be clearly marked as a Radon Vent.

Additional Resources 

• EPA’s map of radon zones, including state Radon Information and contacts can be found here. 
• EPA's "Building Radon Out" can be found online here.

Confirmation

The EarthCraft technical advisor will visually confirm compliance during the mid-construction inspection.