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Module 2.1: Ontario Building Code Requi...
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Protection from Soil Gas (Radon)
Radon can enter a house through any opening or crack that has soil on the other side of the wall or basement slab
Older homes may not be setup to mitigate radon gas the way a new home is
Making a home tighter can increase the possibility of radon ingress leading to high levels of radon exposure
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