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Help me diagnose a toilet leak

Posted on 1/3/25 at 3:56 pm
Posted by DrewTheEngineer
Baton Rouge (Oak Hills)
Member since Jun 2006
1142 posts
Posted on 1/3/25 at 3:56 pm
I can flush the toilet 10 time over an hour and have not so much as a drop leak out at the base.

Then come back an hour later, flush it, and water instantly comes gushing out out at the base. Clean up, wait a bit and start flushing fine again with no leaks.

Repeat the process a week or two later.

Note: this occurred with the old wax ring and the new rubber seal I recently put it.

Posted by SouthernInsanity
Shadows of Death Valley
Member since Nov 2012
22136 posts
Posted on 1/3/25 at 4:06 pm to
Normal things to check if it's leaking at the base is wax ring, flange bolts to tighten down, toilet isn't level, or maybe you have something hung up in that lower part of the toilet.

Had a similar issue when I son was young. The toilet would over flow, we'd snake it and it was fine and then it would just repeat. Finally had my plumber out... he ranked it and said, yep I'm hitting something. Pulled the toilet and there was a school craft popsicle stick cross ways in the very bottom.
Posted by Shexter
Prairieville
Member since Feb 2014
16782 posts
Posted on 1/3/25 at 4:24 pm to


Tree roots way down the line
Posted by greenbean
USAF Retired - 31 years
Member since Feb 2019
5711 posts
Posted on 1/3/25 at 4:38 pm to
I start by pulling the toilet and replacing the wax ring.
Posted by gumbo2176
Member since May 2018
17968 posts
Posted on 1/3/25 at 4:39 pm to
quote:

Tree roots way down the line



Pull the toilet and start dumping 5 gallon bucket of water down the drain line to see if it backs up.

If on the first floor, just run a hose with a shut-off nozzle to the bathroom and not worry about the bucket.
Posted by Turnblad85
Member since Sep 2022
3147 posts
Posted on 1/4/25 at 7:57 am to
After it starts flushing fine, make the flapper stay up so water continuously flows without the "slug" of a normal flush. After flowing for a few min, try to flush normally. If it immediately leaks, then you have some low spot/restriction down the line that is getting cleared with the full flush but filling back up when water slowly enters the line like from a vanity or leaking toilet.

I doubt its a gasket or toilet issue. Almost certainly a downstream problem.
Posted by 98eagle
Member since Sep 2020
2624 posts
Posted on 1/4/25 at 3:38 pm to
quote:

I start by pulling the toilet and replacing the wax ring.


My plumber says he always put two wax rings on top of each other and mashes them down to get a good seal. Any plumbers out there think that is a better solution to use two wax rings instead of one?
Posted by TBoy
Kalamazoo
Member since Dec 2007
26035 posts
Posted on 1/4/25 at 3:48 pm to
There’s always the possibility that the leak is inside the porcelain or at the tank connection to the bowl and it builds up sitting between flushes. Flushing rapidly won’t show the leak. It can still look like a leak at the floor.
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