Jim Breer
I need help:
David & Karen (D&K) bought this ranch style home with a drive-in basement and a walk out basement on the opposite end. This home was originally built with an in ground pool in the basement. When D&K bought this home the pool had already been filled in and a concrete slab poured over the pool. The basement is nearly complexly finished space. The house was weatherized after D&K moved in. Radon testing resulted in over 10 pCi/l.
Some time in 2008 or 2009 D&K had a sub slab depressurization system installed with a HS 5000 fan. Within 48 hours the HS 5000 stopped working, a second draw point was installed within 8 feet from the first. A second HS 5000 was installed. (WC-18”) Post-testing results were not available. Several days later that fan stopped working. Moisture. A third HS 5000 was installed.
The third fan worked for several summer months before stopping again. D&K gave up until 4/10. At that time K called me. I removed the HS 5000 and sent it to Radonaway. They determined that moisture was the cause of the failure. Radonaway recommended reducing the fan to a HS 3000. This was installed. (WC-10”) K also bought a Home Radon Monitor.
Radon levels did not lower below 8pCi/l.
6/10, we did a water radon test. 3300pCi/l.
12/10, A HRV unit was installed in the basement Radon levels went up.
2/11, Installed a third draw point on the opposite side of the basement, about 28 feet from the first draw point. The piping for this draw point was run out through the garage, up through a pantry room, into the attic and over to the fan, with the connection tie into the original stack pipe. About 90 feet of pipe. (WC-8.0 at all draw points) Radon test results, 5.0 pCi/l.
3/11 Installed 4th draw point about 16 feet from the 3rd draw point. (WC1.5) Ra-don test results 5.0pCi/l.
4/20, installed 5th draw point about 14 feet along basement slab edge from 4th draw point. (WC-1.5) Radon test results 11.9
4/28, closed all dampers in the 3rd, 4th, & 5th draw points. (WC-1.5) Radon test results, 11.9.
The soils under the slab is moist course gravel.
Any suggestions?
Jim Breer
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