I'd hoped, but not expected, that a second round of radon tests might have more positive results. The second time around I used a different brand: Kidde radon tests. And, the house was closed up for most of the time, as my daughter and I were away on a trip.
Each time I tested the same two locations: the lower level family room (living area) and the crawlspace (unoccupied). The results in picocuries per liter (pCi/l) were:
April (Kidde brand): 4.8 family room, 37.5 crawlspace
Feb (Accu-Star brand): 3.6 family room, 27 crawlspace
Radon mitigation is a for sure part of the to do list now. EPA says do something for occupied areas over 4. As we seal up the house, we want to make sure we're sealing radon out, not in. The high levels in the crawl space reflect radon escaping from the soil into the crawl space air. There are lots of ways to deal with this and we'll just have to figure out a strategy that works with the overall sealing and insulating planned for the crawl space.
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