Attaching radon/vapor barrier to Inside of ICF stem walls
So let’s say that I want to build a conditioned crawl space. The stem walls would be concrete filled ICF blocks. The floor could be 4″ of gravel, 2″ of reclaimed XPS, a radon/vapor barrier, then a 2″ concrete rat slab. If I run the radon/vapor barrier up the side of the ICF about 6″, and “glue” it to the ICF foam wall with some sort of sealant/adhesive, will that form enough of a seal to keep radon from getting past? Or could radon work its way up through the ICF foam and enter the conditioned crawl space?
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