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 Clogged toilet caused major flooding
Author: rogerbay (FL)

I manage a vacation home and got a call that the toilet was flooding. When I got there I found the toilet was clogged with too much paper (looked like they tried to flush 1/3 of a roll!). Anyway, the entire downstairs was flooded, but I don't understand how. If the toilet clogged shouldn't the overflow be limited to whatever water is held in the tank? The guest said they tried to flush the toilet 2 or 3 times, so I could see an overflow of 2 or 3 tanks fulls, but the entire downstairs was flooded and my shop vac picked up at least 50 gallons of water. After the clog was removed the toilet seems to be working properly, no stuck toilet lever, it fills normally and the flapper isn't leaking. So I just don't understand where the 50+ gallons of water came from if they only tried to flush 2 or 3 times.

EDIT: here's my guess what happened, after the first flush the tank emptied into the bowl and b/c of the clog the bowl filled to the top and may have slightly overflowed. In the tank the flapper closed b/c all the tank water was able to drain out. Then the toilet was flushed a second time. Now the tank is trying to empty into a full bowl so it empties much more slowly b/c now it's fighting the weight of the water in the bowl. At the same time the fill valve tries to replenish any water that has slowly drained out of the tank. If the in and out flows are just right so they ~ balance then the tank level never goes down far enough to allow the flapper to close and BAM, water just keeps pouring out of the toilet. I figure this scenario is reasonable given all the individual components of the toilet are working fine now that the clog has been cleared.

Edited 1 times.

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 Re: Clogged toilet caused major flooding
Author: North Carolina Plumber (NC)

If the flapper is leaking thru, the fill valve is leaking thru, or the water level is set too high in the tank, then a clogged toilet can cause lots of water damage. I've saw it happen before.

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 Re: Clogged toilet caused major flooding
Author: bernabeu (SC)

the water level in the tank is set too high

w/o a clog the excess goes down the overflow into the bowl

WITH a clog the excess ends up on the floor - possibly a very small CONSTANT trickle

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Retired U.A. Local 1 & 638 ~ Measure Twice & Cut Once

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