Recently installed an energy recovery ventilator, an excellent alternative to plastic sealer in a dirt basement or crawlspace, if radon levels are below 15 pCi/L.
This turned out to be a tough job, where I burned through 2 $40.00 hole saws while drilling through two layers of 100 year-old wooden support beams and a layer of brick to route the ducting to the outside, but I got it done!
