If my radon level is only 4.2 pCi/L, will it help to seal cracks in the floor? If so, with what?
If your initial test result is 4.2 pCi/L based on a short term test, another test should be conducted as a follow-up. It is possible that the result of such a test would be below 4.0 pCi/L. However, if your home’s actual radon concentration is 4.2 pCi/L, sealing cracks in the floor and wall joints is a good first step in solving the problem. A gun-grade polyurethane caulk should be used. This should be considered a first phase, to be followed by another short-term test, and possibly other solutions.
