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 Toilet knocking/vibrating before flush
Author: SMInteriors (MI)

Why would my toilet make a single knocking or thud noise and toilet vibrate shortly after sitting on it? We have a new house, less than a year old. I have noticed this happening twice (months apart) on the first floor and once on the second floor. Not sure if this has happened outside of these occurrences or other toilets. Just have not experienced. Note these toilets were not used for hours before this. My husband did use another toilet on same floor a few minutes before this occurred on most recent instance.

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 Re: Toilet knocking/vibrating before flush
Author: packy (MA)

WOW... i can not think of any reason sitting on a toilet would cause a thunk/thud noise ???

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 Re: Toilet knocking/vibrating before flush
Author: george 7941 (Canada)

Do you hear water flowing into the tank (tank filling) after the thud?

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 Re: Toilet knocking/vibrating before flush
Author: bsipps (PA)

Loose nail in the subfloor?
Does the toilet wobble?
Brand new house under warranty, contact the builder

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