ARE MY GRANITE COUNTER TOPS A RADON PROBLEM?
The short answer is probably not. Radon’s source is soil and rock. It stands to reason that building materials containing rock (tiles, granite, stone for a fireplace hearth, etc.) could be a source for radon. However, Health Canada has found that the contribution to indoor radon levels from these materials is generally very small (Health Canada, 2017).
The main radon culprit is soil and rock under and around the building's foundation. We have yet to see a home that could not be fixed by addressing the radon intrusion from outside the home. We will look at radon entry in our next post.