I have seen countless ideas on how to do this so i'm not sure which direction to go....just which one not to go....(which would be what i just got done ripping out)
Here's the scoop. 100 yo house. upstairs bath was an afterthought built into a bedroom. already know the sources of my water problems, the previous shower was removed because the base had so many cracks it was raining into the kitchen and upon demolition found the plumbing also had minor leaks. the shower area is 36X36. the floor (or subfloor) is 1/2 in thick pine t&g slats. the old base was just slapped in on the t&g, and the floor underneath wasn't leveled (but the base was by screwing to the studs) my feeling is the shower failed because of floor not being properly prepared for the additional weight and towards the door side it wasn't even resting on the floor so all the weight from us stepping in was on the fiberglass. the t&g is surprisingly intact, had my hubby put weight on it in different places and although it's not pretty i don't think it's structurely deficient.
i would give u some pictures but i can't find the usb cord for the digital camera....gonna have to ask the kids when they get home.
our idea is to leave the t&g, use a little self leveling floor compound (looking at roughly 1/2 in difference from front to back), and put 3/4 in treated ply with 30lb roofing felt and then set the shower base. to help from underneath (there is drop ceiling in the kitchen) i could put blocking in between the joists on the sides running perpindicular to give it a little extra stability.
I don't care if the base is a little higher than the existing floor because once the shower is done i plan on ripping out the rest of the luan and sticky tile anyway.
does this sound like a good plan? i don't want to be doing this again in another 5 years...