This is why proper training is so important.
Received a call yesterday. A couple is selling their home, and needed a Radon system. The first company made several trips, used 2 inch pipe, seven suction points and the biggest fan he could get. Still testing in the 20’s. 2nd company replaced pipe with 3 inch, eliminated 2 suction points, and pulled out gravel to make an actual suction point. Same fan. Still testing in the 20’s. Company now plans on installing some drain tile under slab. Did I say there was gravel under it? I asked potential customer if either company did any smoke tests or communication tests with a hand held electronic device. No, they didn’t. So these companies ideas is to Swiss cheese a slab and put on the biggest air fan possible and keep on charging the customer and hope something works but never do any diagnostic tests to see what’s causing the system to not lower levels.
When my manager Brandon arrived he could hear the air leaking at the cold joint. We did a smoke test, some caulking and then started a new test. Levels came down below 4. We saved the customer quite a bit of money by doing the simplest of tests. I think the first two companies should return some money to the customer.
Both companies are certified. This is why we need to require longer hands on training before someone gets certified to mitigate Radon.