I did initial testing Saturday to determine if it would be possible to mitigate a large home by utilizing a subslab radon system. This is where we drill one hole (1") where we insert an industrial vacuum nozzle, and then drill a smaller hole at the other end of the house. We then turn on the vacuum cleaner and then go to the other hole where we hold a smoke-stick over it, to see if smoke is drawn into the hole. A positive test means we probably have good air flow beneath the concrete slab.
Failing the Smoke Test
Passing the smoke test
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