Radon mitigations for a homeowner that are not part of an ongoing real estate transaction are guaranteed post-mitigation results of 2.0 pCi/L or less in the “lowest livable space.” *
Radon mitigations for a homeowner that are part of an ongoing real estate transaction are guaranteed post-mitigation results of 4.0 pCi/L or less in the “lowest livable space.” *
*Livable space is an area that can be converted into conventional living space such as any other room in the house without extraordinary efforts such as raising the house, replacing the foundation, and/or pouring a concrete floor.
The lowest livable space in a house is almost always the basement. The exceptions are usually basements of very old houses with dirt floors or laid-up stone foundations; and/or low head clearances where people have to duck low hanging pipes or bearing beams.
The basement space may have storage area available for canned goods or seasonal stuff or even laundry facilities, but this does not constitute “livable” space.
In these homes, radon measurements are taken on the first floor. Occasionally home inspectors sample for radon in these basements anyway. Highland Air will not provide an estimate if the radon samples were collected incorrectly.
Radon results for Highland Air Inc. for 2013:
Prior to mitigation:
- The average concentration of radon prior to mitigation was 16.2 pCi/L.
- The highest concentration of radon prior to mitigation was 180 pCi/L.
- The average concentration of radon after mitigation on a system built entirely by Highland Air Inc. ** was 0.61 pCi/L. (outdoor air is 0.3 – 0.4pCi/L)
- 88 percent were between 0.3 and 1.0 pCi/L
- 12 percent were between 1.1 and 2.0 pCi/L
- The highest post-mitigation result was 2.0 pCi/L
**Radon mitigation systems that were not entirely designed and installed by Highland Air are not included in this data – such as systems that were started by a building contractor or systems that were corrected by Highland Air Inc.
Highland Air has to work with partial or completed systems that are not designed by Highland Air. All results are still under 3.0 pCi/L after the system is completed or corrected by Highland Air.