Radon - New Home Construction

Find a Builder Using Radon-Resistant Construction

Radon-resistant construction techniques may vary, depending on the foundation and site requirements. A house built to radon-resistant standards will include these basic elements:

1. Gas-Permeable Layer - a layer placed beneath the slab or flooring system allows the soil gas to move freely beneath the house. In many cases, the material used is a 4-inch layer of clean gravel.
2. Plastic Sheeting - plastic sheeting placed on top of the gas-permeable layer and under the slab helps prevent the soil gas from entering the home. In crawlspaces, the sheeting is placed over the crawlspace floor.
3. Sealing and Caulking - sealed openings in the concrete foundation floor reduce soil gas entry into the home.
4. Vent Pipe - a 3- or 4-inch gas-tight or PVC pipe (commonly used for plumbing) running from the gas-permeable layer through the house to the roof ensures that radon and other soil gases are safely ventilated above the house.
5. Junction Box - an electrical junction box can be installed in case an electric venting fan is needed later.
6. Moisture Reduction - soil moisture is vented through the system. This reduces mold, mildew, and odor, especially when activated with a radon reduction fan.

For more information, refer to the guide: Building Radon Out (5 MB)