Systems for residences with a crawl space, no crushed rock under the slab (common in older homes), or an entirely ended up basement, reduced level, a garage attic room installation, etc. might cost more. Radon can not be seen, scented, felt, or otherwise found, other than with an examination. That's why, according to the EPA, the only means to understand for certain if you have a radon issue is to examination. This approach utilizes suction points that are pierced in the subslab (usually 4 to 6 inch openings that resemble hollow pits).
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