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tgogola · Joined: 26 Oct 2006 Posts: 3 Location: Michigan

After flushing the toilet, the pipes under the house seem to vibrate about 15 seconds after the flush, I'm assuming it is when the water is refilling into the toilet. The vibration lasts about 10-25 seconds. This noise is not made when the shower, sink, dishwasher, or washing machine is used. Only the toilet. My dad lowered the water pressure at the toilet and the noise went away for a week, but now it is back. I am pretty sure the toilet is the last piece of equipment along the drain line (if that makes sense), meaning I think it is the closest to the main city line, everything else is further down the pipes. I do have a crawl space, so my pipes are easily accesible. Please help me.

hughstary · Joined: 21 Oct 2003 Posts: 30 Location: Hampshire

Do you have a conventional float valve (i.e. controlled by a ball on the end of an arm ?). If so it's probably caused by vibrations induced in the float arm by ripples on the surface of the water as it fills the cistern.

You can cure this by fitting an equilibrium valve (Torbeck valve in the UK) which doesn't use an arm and ball and normally uses a plastic tube to fill the cistern from the bottom, thereby causing less disturbance on the surface of the water.