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.
Our ground here is clay as well. I wonder if that radon issue could be solved with a thick concrete floor plate. Probably not, because otherwise I'm sure they'd do it. (or not, because they're staring blindly at their building regulations...)
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