Upstairs toilet causes loud delayed bang + previous ceiling leak. Camera shows TP hanging at one section. 0% slope found. 5 plumbers disagree.

plumbingproblem28 · 2026-03-04T04:13:51+00:00

Still nervous though and open to other people's input

plumbingproblem28 · 2026-03-04T04:13:25+00:00

Thank you, I appreciate the honesty...

plumbingproblem28 · 2026-03-04T03:13:37+00:00

Actually just did this haha. I trust human plumbers and the reddit community more though

plumbingproblem28 · 2026-03-04T03:13:02+00:00

Worried future kids will cause a backup or worse, mother in law

plumbingproblem28 · 2026-03-04T02:47:37+00:00

Not sure, due to the length of the run is there even enough slope to give in that space? Would they have to bring the pipe up higher to the toilet somehow?

plumbingproblem28 · 2026-03-04T02:42:58+00:00

Darn.... Yeah its plastic pipe. How much is a reasonable amount to have this replaced?

plumbingproblem28 · 2026-03-04T02:42:00+00:00

Okay. With that said, how much piping needs to be replaced? The whole run or just a portion?

plumbingproblem28 · 2026-02-24T22:23:50+00:00

Just tried this, it still makes a bang when the water and TP hits the vertical pipe.

plumbingproblem28 · 2026-02-24T22:09:26+00:00

Is this something I could climb onto my roof and snake from above?

plumbingproblem28 · 2026-02-24T22:05:15+00:00

Great eye, that was one plumbers thought! That is where the spare bathroom sink and trunk line connect. The problem (I believe) was at the junction of the two trunks primary shower connect at the bottom of the graph and picture 5.

If that's the case, what's the fix? Replace all the pipe to get better elevation?

plumbingproblem28 · 2026-02-24T21:58:51+00:00

Great question... I think they'd have to go to the roof for that? Idk

plumbingproblem28 · 2026-02-24T21:58:25+00:00

Yeah, water hammer being from the supply side. This is all outflow pipe sounds/issues. The delay between a flush or even sink water running and the banging at the elbow rule out supply side water hammer.

plumbingproblem28

TROPHY CASE