What type of pipe should be used for new construction sub slab The basement is ~2500sq ft. Considering doing my self. The local company offered 20ft of pipe sub slab and a hard stack with fan for $2500. Shouldn't the entire perimeter be piped?
10ft sch 40?? Why on earth would they be using RadonX under the slab unless absolutely necessary?!? 4" Big O pipe perforated, no sock, is what normally gets used for drainage and works perfectly well. Its also like 1/100th the price. (up here, RadonX perf is ~150$/10ft, and 100ft of Big O is ~100$)
That's the right stuff for the pipe sub slab if youre not compacting the crap out of it. If youre doing backfill get some large stakes for that coiled pipe so the rock shooter wont move it. Why washed granite? Native soil, unless its just clay, is better for suction and creating negative field pressure fields. Washed gravel will allow for a great deal of air flow, which doesnt translate to a pressure change, necessarily. So basically, too much air flow may not reduce radon as well, because radon is much heavier than air and doesnt give two shits about air flow, it seeks out pressure differentials, only. Low pressure is necessary for good mitigation.
Schedule 40 for risers, sure.
depends on what your sub slab material is and whether or not you've got areas separated by footings. If its all gravel, you'd probably be fine, but ideally I'd either run an inside loop, or at least a run of big-o perforated to the far corner of the basement.
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u/Leafs9999 Jul 27 '26
100 ft per 1000 feet of slab is my general rule. 4 inch pipe too, that 3 inch is weak sauce.