I ripped my old shower down to the studs and joists. The studs were rotten, the subfloor was rotten, and the top of the joists (in some places) were weak and rotten.
I plan on replacing some studs and sistering others. Joists I'll likely epoxy and sister before installing new subfloor. I'll be pouring a new concrete shower pan. The issue is that the previous subfloor was 1/2" ply over joists 17 1/2" OC - by my research, not enough support.
First, am I correct in determining 1/2" as not enough support ?
Second, since the surrounding framing and drain pipe are in place assuming a 1/2" subfloor, is my only recourse going to be to cut the base plates, take a 1/4" off the wall studs and extend the drain pipe ?