When new homes are built, they can be constructed with radon resistant features. Adding these features during the construction process is much less expensive than adding radon-resistant features later on. According to the United States Environmental Protection Agency, the cost of Radon Resistant New Construction is usually between $250 and $750. The cost could be less than $250 if the builder already uses some of the same techniques used for moisture control. The cost of installing a radon mitigation system post construction is between $1,200 and $2,000.
Homeowners who have radon resistant features in their house should still test their home for radon every two years. Test kits can be purchased at Linn County Public Health, at local hardware stores, or by clicking here.
Finding a Builder Who Uses Radon-Resistant Techniques
All homes and additions to existing homes in unincorporated Linn County must be built using radon-resistant techniques. For many, finding a builder can be difficult, but finding one who uses radon-resistant techniques can be easy. The EPA provides a Directory of Builder who are using this technique, which can be found by clicking here. Once you have chosen your builder, use this EPA checklist to be sure that radon-resistant features have been installed in your home.
How Does Radon Resistant New Construction Work?
A gas permeable 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.
Plastic sheeting 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.
All below-grade openings in the concrete foundation floor are sealed to reduce soil gas entry into the home.
A 3 to 4 inch gas-tight or PVC pipe runs from the gas permeable layer through the house to the roof to safely vent radon and other soil gases above the house.
An electrical junction box is included in the attic to make wiring and installation of the a vent fan easier if you choose to install one down the road.