r/radon

Hi all--I was hoping someone could give me some advice; around two weeks ago we lost power during a moderate-to-heavy rainstorm, and naturally the mitigation system let in a fair amount of rain, directly underneath the house slab. Since then, it seems like the system isn't working as well.

The system itself is a GX5 fan, pulling directly from a subslab soil void, as we don't have any gravel/rock base. We are using two monitors to test radon, an Airthings Corentium Home and an Aranet Radon+, and their measurements correlate.

Before the outage, the levels were around 1.5-1.8 pCiL, with occasional rises into the low 2's. This was even during some intense rains. Immediately after the power came back on, the first week or so was above 6, before beginning to drop. Now, the average is 3+, with rises above 5. Levels look like they're plateauing here, based off measurements from this past week.

The fan itself seems to be working--however, when calling our company to check the system out, the guy physically pushed the monometer up (I guess it was installed too low in the plastic holder?). So now, we've lost our only reference to suction levels from before the outage.

Any advice would be appreciated. Also, if it's pertinent, the company does hold AARST and NRPP certs.

Hello everyone. I’m interested in having my crawl space encapsulated with the works ( dehumidifier, insulation etc). Is there any vapor barrier that works not just to stop moisture, but soil gases as well? I’m hoping to avoid installing a crawlspace fan vent, which I know some people do for this issue. Any advice would be appreciated. Thanks.

I wrote some python code to pull data from Airthings Wave and also query weather databases to plot radon level versus weather data. Right now I read the last 24 hour radon level in Beq, local barometric pressure and precipitation over the last 24 hours. This is data from my home which has radon mitigation installed. I added the precipitation data just a few days ago so it wasn't active during the first bump up in radon level. Will still continue to develop and add more inputs for correlation studies.

https://preview.redd.it/zi1pml4osith1.png?width=1200&format=png&auto=webp&s=fc5f17433702f2b1dc3ebc00197cc31c442593f0

I had a mitigation system placed about 2 years ago in my basement. System is in an unfinished room. Readings still 8-12 in the room with the system(next to the sump pump). Readings vary 0.6-8.6 depending on time of year in the other parts of the basement which are finished and living spaces. Installer said the substrate was clay and that may alter efficiency of the system. I know we have numerous cracks and ways for radon to get in the house. But going back and trying to fix all of them would require a total gut to the finished parts. Do I add another system? Upgrade? Move? Get another installer to replace or fix?