Radon buildup??? Never heard that one before. And indeed, with the materials used I don't see how this could ever happen. These materials don't need ventilation. Hey hey building regulations, I know... don't get me started on those!
It's an issue in some parts of the UK which sit on granite, radon seeps out of the ground so regs demand a ventilated substructure. We sit on solid clay but still had to follow the reg, apparently some places will let you build without a void but our officer wasn't interested in listening.
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