The air pressure inside a building is usually lower than in the soil surrounding the foundation. This draws in gases, including Radon, through openings in the foundation where it is in contact with the ground. This includes construction joints, gaps around service pipes and support posts, floor drains and sumps, cracks in foundation walls and in floor slabs, and openings in concrete block walls. Radon can also enter into your home from your drinking water. However this source is usually associated with deeper wells. Another potential source is from building materials but, there are very few cases in which this ended up in contributing excessive amounts of Radon gas into the interior of the building.
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