Are Radon sumps not part of building regulations/code everywhere then? Here
in Ireland as far as I'm aware all new construction must have a radon
barrier & radon sump. In high risk areas these must be retrofitted in some
cases if I'm not mistaken. 

These regulations are, like all regulations, sometimes over applied. I had
my home extended a couple of years back & had to have a radon barrier & sump
fitted. I ended up with a large room, one half of which had the radon
protection fitted & the other half (>100 years old) had none. Guess I'll be
fine if I stay in the new half......


Joe

> 
> Many things we have not mentioned, air exchangers, radon gass 
> venting, etc.
> 


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