But don't get too worked up now, because there are easy ways to test your home for radon. You can call a professional to test for radon in your basement (or the lowest part of your house), or even test for it yourself by purchasing a test kit. When testing, you want to make sure that your home tests lower than 4.0 pCi/L. The average home has 1.3 pCi/L.
If your home tests higher than 4.0 pCi/L, it is quite simple to lower it to safe levels. Most professionals will use a technique called soil depressurization. They will run a PVC pipe through the slab (which means drilling a hole in it) or underneath the membrane in a crawl space, and then route it up through the roof. A fan is often attached in the attic area, drawing the radon from below the slab (or membrane) and venting it above the roof.
The best way to protect a home from radon is to build the home with the PVC pipe from the beginning. This will cost around $500 for materials and labor (much less than the $1000 to $2500 it could cost to retrofit the house). Although each home is unique, the same basic five steps recommended by the EPA apply.
- A. Gas Permeable Layer: This layer, often 4 inches of gravel, is installed below the slab or crawlspace to allow radon to move freely underneath the house.
- Plastic Sheeting: 6-mil polyethylene is placed directly on top of the gravel base to prevent the radon from entering the home. It should be placed either below the slab or over the crawlspace floor. Make sure it is properly sealed along the edges and at seams.
- Sealing and Caulking: Seal all openings in the concrete floor to prevent the radon from entering the home.
- Vent Pipe: Install a perforated T-fitting under the plastic sheathing. Connect a 3 or 4 inch piece of PVC to the T-fitting and run it through the roof. This way the radon will bypass the home through the stack pipe.
- Junction Box: Install an electrical junction box near the pipe in the attic so that if radon levels get too high, an electric venting fan can later be installed.