P-trap position for new bathtub

[kacheln]

Hi all,

I am in process of installing a new alcove tub and have torn the old one out that was elevated off the bathroom floor 1.5" by 2x4's. I would like to drop the new tub back down to the plywood and have a few questions. (For perspective, I am a relative newb to plumbing but have done some PVC welding and can sweat copper pipe and have installed shower valves, etc.). All images are from the old tub plumbing.

1) Is that P-trap, (which I believe to be from original 1986 build), acceptable?
2) I would like to cut the plumbing at the joint in the photo and use a ram-bit to ream the joint out and accept a new riser. That will put my new riser off center to the center line of the tub (see top view photo of tub). This will force my drain and the overflow to come in at an angle, is that acceptable plumbing practice?

Thanks,
Scott

 

[Terry]

I would open up more of the plywood and see if there is a way to move the P-Trap.
You can angle over and use fittings, but it's nicer if you just start new.

 

[Sponsor]

 

[kacheln]

I would open up more of the plywood and see if there is a way to move the P-Trap.
You can angle over and use fittings, but it's nicer if you just start new.

Terry, thanks.
I would prefer to replace as well but I will have to go pretty deep in there, it is all joints up to the vent as you can see in the picture here, and I would have to cut pretty far back into the plywood to get to all that, and then it will be a splice into the vent and the drain run to get a new t-joint n there to rotate so I can reposition the p-trap.......seems like major surgery. View attachment 34891

 

[Plumber69]

A few times I had to change the waste overflow configuration so it drained horizontal instead of straight down.