There is a lot of attention to detail that has to be paid during the construction. One requirement of the radon mitigation is to caulk all the penetrations through the slab. Since our water lines and drains do penetrate the slab, I have to remove the cushioned foam at the slab level that protected the pipes during the concrete pour and caulk the edges around the pipes.
Sealing around some of the openings required a LOT of caulk. I used the Loctite Heavy Duty PL375 low VOC caulk that we have been using for the whole project. There is a lot of caulk to bridge the wider gaps caused by the double pipes in some places. I filled the gaps with backer rod and then caulked over the gaps.
The penetrations without gaps in the concrete slab were much easier to caulk.
The caulking precedes the walls that go up around the pipes. So tomorrow these bottom plates will be glued for walls to be built next week.