Originally Posted by FearnConstruction
Make sure there is 12" of backing or blocking on your walls and 7" of curb (2x4 treated plus 4x6)
Personally, I would not use the membrane, especially upstairs. Buy an "Insta-Set" drain for your 2" pipe. Replace the P-trap underground. Cut off your pipe even with concrete height or 1/2 above concrete height. Put some liquid soap on instaset to lubricate. Set it over the pipe and press down. Tighten bolts. pour mortar in pan even with the widest part of the drain. Slope it 1/4 every foot so water drains. Call for "hot mop" or "shower pan" professional to use tar for waterproofing. After thats done. line pan with diamond lath. Mix mortar with little water till it feels like wet sand and pack it in the pan 1/4 below top of drain and 1/4" slope per foot over.
You must be from California, yes?.
1/4" at the drain is too thin, unless this is for a preslope, which would be under the hot mop, never seen it done or used it here, never a problem with CPE either.
1 1/4" at the drain for the final slope, even with Kerdi.