Plumbing Forum - Professional & DIY Plumbing Forum > General Plumbing Discussion > General Plumbing Help > Thumping in the pipes when I flush toilets

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Old 08-08-2017, 01:26 AM   #1
arff
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Default Thumping in the pipes when I flush toilets

For some reason my pipes have suddenly started thumping when I flush my toilets. The thumping seems to be coming from the location where the main enters the basement. I thought maybe the vacuum breaker on the sprinkler system was bad, which is directly adjacent to the where the main comes into the house, but the thumping continues even after I close the sectional valve that controls the lawn sprinklers which is upstream of the vacuum breaker. the pressure in the system has not increased (city water). Any thoughts \ tips | or suggestions on localizing the issue would be appreciated. Thank you.


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Old 08-11-2017, 10:18 PM   #2
qosmioamit
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Check out this video from "This Old House"
https://youtu.be/3-Bhr2IKIF8

It's likely because the vent pipe for the sewer gases is loose and not secured.
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Old 08-12-2017, 08:49 PM   #3
arff
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Default Thumping is from the water pipe not drain pipes.

The water hammer may be coming from the installed prv. Do they go bad? How can I test it?
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