Prep for deck mud pan
Just finished the demo on my tiny (~35"x35") alcove shower and found that the builders exploited the shape of the old acrylic shower (it narrowed at the base, creating a fairly large void) to be really lazy when they framed it up, so these pipes protrude about 2 inches into what would have been my shower space. They are T'd into another line that feeds another bathroom and the vanity in this bathroom - I think they might be redundant altogether. The hot line does not get hot when the hot water is turned on in the other bath. Assuming that they're pressurized at all (which I'm not convinced of but can't think of a way to check without cutting the line), is there a way to cap these off below grade so that I can tile over them? If not, I'm just going add a 2x4 on its side + 1/2inch furring strip to the studs and sacrifice the space unless there's a major problem with that. Second question: what's the best way to fill in the box out around the pipe in preparation for a deck mud pan (flowFx + liquid waterproofing). (Bonus gatorade from 1998 that the builders so kindly left in my wall)