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Question DetailsAsked on 9/19/2017

I am having bang sound in the walls every time when toilet tank stopped to filled water in.

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1 Answer


That is "water hammer" or "pipe slam" - the momentum of the water moving through the pipes, when it is suddenly stopped by a closing valve (or sometimes opening too), causes pipes to move in the floors/walls.

Sometimes you can solve it by partly closing the supply valve to the toilet, though of course that means it takes longer to fill. Other times just putting restraints on the pipes in teh walls/floor leading to the toilet (padded to prevent squeeking as the pipe expands and contracts) works well.

It can sometimes be a sign of excessive water pressure (say over about 60-70 psi), in which case for several hundred $ a plumber can install a pressure regulator on the incoming supply line wherre it enters the house to control that.

Otherwise, a plumber can install a water hammer surge arrestor in the piping - typically about $15-50 for the arrestor (or an air-filled standpipe piping which also acts as a shock absorber) plus typically minimum service call charge of $75-150 for the first hour work (more in highest cost areas) for a Plumber to install it, not including any required drywall repair which might typically run a couple hundred to few hundredby a Handyman. In probably most houses with exposed piping in the basement/garage under the toilet this can be done with no drywall damage.

Answered 3 years ago by LCD

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