Radon in Homes - Mitigation
Vapour / radon barriers below slab floors
...radon barrier. Radon gas occurs naturally in the soil, a result of decomposing uranium in the ground. So it's everywhere, but more intense in some locations than others.
A passive radon stack are also a prerequisite under the LEED for Homes program. Radon gas is the second greatest cause of lung cancer after smoking....