What does the EPA recommend?
Take steps to prevent device interference when conducting a radon test.
Why buy a radon-resistant home?
What are Radon-Resistant Features?
The techniques may vary for different foundations and site requirements, but the basic elements are:
A. Gas Permeable Layer
This layer is placed beneath the slab or flooring system to allow the soil gas to move freely underneath the house. In many cases, the material used is a 4-inch layer of clean gravel. This gas-permeable layer is used only in homes with casement and slab-on-grade foundations; it is not used in homes with crawlspace foundations.
Illustrations of areas where radon could be entering a home
B. Plastic Sheeting
Plastic sheeting seams sealed is placed on top of the gas permeable layer and under the slab to help prevent the soil gas from entering the home. In crawlspaces, the sheeting is placed over the crawlspace floor.
C. Sealing and Caulking
All below-grade openings in the concrete foundation floor are sealed to reduce soil gas entry into the home.
D. Vent Pipe
A 3- or 4-inch gas-tight or PVC pipe (or other gas-tight pipe) runs from the gas permeable layer through the house to the roof to safely vent radon and other soil gases above the house.
E. Junction Box
An electrical junction box is included in the attic to make the wiring and installation of a vent fan easier. For example, you decide to activate the passive system because your test result showed an elevated radon level (4 pCi/L or more). A separate junction box is placed in the living space to power the vent fan alarm. An alarm is installed along the vent fan to indicate when the vent fan is not operating properly.
Did You Know?
What Can You Do?
Simple, inexpensive techniques can be used to lower radon levels and increase energy efficiency in your new home. Here are basic steps to follow when buying a new home.
1. Check Your Area's Radon Potential
Find out if you are buying a home in a high radon area. The Environmental Protection Agency's map of radon zones shows which areas have the greatest potential for elevated indoor radon readings. Homes in places with high radon potential, called Zone 1 areas, should be built with radon-resistant features.
2. Install a Radon Reduction System
Talk to your builder about installing a radon reduction system. You can obtain free copies of the EPA's Model Standards and architectural drawings and use them to explain the techniques to your builder. Let your builder know that the radon resistant features can be easily installed with common building practices and materials.
3. Remember: Test Your Home
Every new home should be tested for radon after occupancy. Test your home even if it has the radon resistant features. Test kits are inexpensive and may be purchased at your local hardware store. Or have a professional test the radon for you.
4. If Radon Levels Are Still High, Activate
If your home tests at 4.0 picoCuries per liter (pCi/L) or above, activate the system by installing an in-line fan. Call a local radon mitigator about installing the fan. Consult one or both of the national radon proficiency programs or your state radon contact for a list of qualified radon service professionals near you.