Full Description

There has been substantial concern about thepotential for radon levels to increase in homes undergoing energy retrofits,especially those including substantial air sealing. This study evaluated ifprecautionary measures could curb increases in radon in over 250 homesreceiving energy efficiency retrofits. The goal of these precautionary measureswas not to provide full radon mitigation, but rather to avoid increases inradon following retrofit. Primary precautionary measures included installationof exhaust ventilation, covering of bare dirt in foundation spaces, andinstallation of sealed sump pump covers. Large cracks in the foundation werealso sealed in some homes. Radon was measured in every basement and on everyground floor for a two-week period. In an attempt to account for variability ofradon due to external factors, control homes were measured at the same time. Controlhomes were located in the same general vicinity as retrofit homes and did notreceive any energy efficiency upgrades during the project period. Radon wasmeasured before retrofit and after retrofit. In as many homes as possible,radon was also measured approximately one year after retrofit to assess thepersistence of the measures. The results showed that, relative to a prior studyin which these precautionary measures were not done and radon levels increasedby a statistically significant 0.4 picocuries per liter (16 Becquerels percubic meter) in the lowest occupiable level of the home, no statisticallysignificant changes in radon were found with the precautionary measuresinstalled.

Product Details

Published: 2022 Number of Pages: 4 Units of Measure: Dual File Size: 1 file Product Code(s): D-IAQ2020-C2-A08 Note: This product is unavailable in Russia, Belarus