I am in the middle of a bathroom remodel that required that a shower be converted to a bathtub/shower. I have already moved the old shower's horizontal branch, run a new vent pipe,and raised and leveled the concrete floor. Since the drain piping is underneath a slab foundation, I left a dap out so that I can later attach the tub's trap. The dap out that I left with the my home made wood box was a little too big (by the way, Oatey tub box was too shallow, horizonatal branch was down too deep in ground) , so now I want to close some of that in. My question is the following: I was thinking about building another tub box with pressure treated wood and simply just leaving it in the dirt and filling in around it with sand and concrete. Or, attach the trap and vertical leg, leave the depressioin necesary to connect the tub's tailpiece, and fill in around it with sand concrete. What would you guys recommend?
It don't matter how deep the pipe is, it don't matter how shallow the tub box is, so as long as you can keep the concrete from that area, when ready remove the box, dig it out the pipe, set trap to desired position, set tub and make up the connection.
Fix it right the first time, so you won't have to fix it a 2nd time.