![\"Radon](\"http:\/\/radontestingdallas.com\/wp-content\/uploads\/2014\/03\/Radon-in-Residence.jpg\")
<\/a>Radon Intrusion Paths into Home<\/p><\/div>\n
The major source of indoor radon is soil gas transported by pressure-induced convective flows (as shown in the illustrations) with potential entry points marked. Radon transport is enhanced when the base of the building is under significant negative pressure. Homes built on soils with higher radon release (based on soil type, porosity, pore volume, water content, etc.) and convection based transport are typically more sensitive to atmospheric factors such as temperature, wind and barometric pressure. Radon movement through soil can also occur through diffusion or both diffusion and convection.<\/p>\n
Homes built on soils with a higher clay content (as opposed to those with sandy \/ gravelly soils) tend to have lower radon gas levels, but there may be trade-offs with higher moisture levels which can give rise to issues with mold, dust mites and general structural deterioration.<\/p>\n
What are the major entry routes into your home?<\/p>\n
1) Cracks in concrete slabs<\/p>\n
2) Spaces behind brick veneer walls that rest on uncapped hollow-block foundations.<\/p>\n
3) Pores and cracks in concrete blocks.<\/p>\n
4) Floor wall joints.<\/p>\n
5) Exposed soil as a sump.<\/p>\n
6) Drain tile, if drained to an open sump.<\/p>\n
7) Mortar joints.<\/p>\n
8) Loose fitting pipe penetrations.<\/p>\n
9) Building materials including some rocks and other decorative stones such as marble and granite.<\/p>\n
10) Drinking \/ tap water.<\/p>\n
11) Open tops of block walls.<\/p>\n
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