Radon is 9.3 pCi/L even after radon mitigation — Is this OK?
Hi. I am having elevated ( 9.3 pCi/L) radon after mitigation done. I have an encapsulated crawl space ( insulated, air sealed, dehumidifier ) with piping running under vapor barrier-which terminates to an outside radon fan connected with a 4″PVC pipe. Would like to find out if it’s Ok to install drainage ( perforated black pipe) piping under vapor barrier ( in encapsulated crawl) for radon mitigation. The piping is spilt off of a main trunk ( no continuous circle) to different sections under the crawl. I have read different opinions on radon design and using black perforated pipe vs white PVC drain pipe. I have also read the piping underneath vapor barrier ( on crawl) should be run in a continuous circle.
One last question-I have an attached concrete porch adjacent/sharing the crawl space foundation-should this have a suction access as well?? I have been told by the company who installed the mitigation company that radon levels fluctuate and this is to be expected.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part