Need to install a shower drain on a concrete subfloor. I've made all the cuts but I'm having a hard time with the fit check because pressure on the pipe inside the hole of my shower drain causes the pipe to move down about 1/2 inch (maybe more).
I can (with pressure) apply a coupler to the pipe inside the hole
then I attach a 2 inch pipe that extends to the surface of the concrete subfloor. From there i need to attach the drain but that requires some pressure and this is where I'm having difficult because when pressure is applied to the pipe it moves.
I'm at a loss on how to keep the pipe stationary so I can attach the drain without movement. Thoughts?
I've attached 2 jpegs. one showing the hole and pipe in the subfloor. the other is my goal.
A follow-up question. This thread (
http://bedgell.com/shower/hallshower2014.html) claims there should be a 1/2 inch between top flange and subfloor. The flange i removed was flush to the floor. Whats the motivation for the 1/2 inch?