Leaking PVC pipe & joist notch

Question

I appreciate any help with my problem below.
I have a PVC drain pipe that is leaking. The drain pipe is from a tiled shower floor. It looks like the joist is pressed up against the pipe elbow and caused it to start leaking. The joist is a 2x10 and the preexisting notch is ~2" from one end of the joist. The joist spans about 10-12' (I didn't measure it when I was down there).

Questions:
1. What's the best way to cut the joist so it doesn't rub against the pipe? Can I just expand the existing cutout?
 1. What is the best tool to use for this?
2. What's the best method to repair the PVC pipe? I've been reading about epoxy putty or silicone tape.
Thank you

Ack · Answer

I disagree that it is the joist causing the issue. When installed, they would have notched the joist so that the plumbing fit and there is no reason that the joist would have moved or expanded in size.

Related, the drain might not even be the source of the leak. While visually it appears that the leak is there, the problem might be elsewhere. Consider that you have tile and it is sloped to the drain. The tile is placed on backing, the backing is what provides the support and the slope. That backing is waterproofed. It could very well be that the waterproofing has failed and that the water is following the slope to the drain. Or that the waterproofing has failed at the drain.

Leaking PVC pipe & joist notch

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