rattling pipes


Old 01-12-14, 05:11 PM
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rattling pipes

We tried to change the innards of the water tank of a toilet but failed. So got a plumber to install new toilet instead. After the new toilet was installed the pipes rattled very loudly after each flush. We thought perhaps when the new toilet was installed, the new flushing system caused a drastic change in pressure. In any case, we strapped down every possible pipe. But no help.

We noticed that after the toilet flushed, when the rattle was heard, the connector 'inflow' hose to the hot water heater tremors. But we just can't locate the rattle! We can hear it behind the drywall. Do we have to break down the drywall to stop the rattling?

Please help and advise. We've worked two weekends on this darn rattling.

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Old 01-12-14, 07:02 PM
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I guess the new toilet's valve opens and closes more abruptly causing a water hammer. You could try a different brand or style fill valve on the toilet before ripping out the walls.
Old 01-12-14, 08:49 PM
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I start by finding out what the incoming water pressure is.
It does not need to be any higher the 60 PSI.
To high a pressure could have caused your initial problem.
Next I'd bleed the air out of the lines.
Just start opening up faucets starting with the ones closest to the incoming water line.
Do not forget the outside faucets, shower or tubs and all the toilets.
Open up the relief valve on the water heater long enough for water to come out.
Old 01-13-14, 09:41 AM
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One other simple thing to check is to ensure the supply valve under the toilet is fully open. If it's an older valve with a worn washer, it can lead to a vibration in the pipes while the toilet is filling.
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