I live in a 2 story apt–I have the lower unit. When resident upstairs would use one of the bath sinks in the morning, I would hear loud banging noise in the wall–only in the morning. I believe he used hot water, turning faucet on and off rapidly. Plumber came, but he went into wall to secure pipes nearer a different sink in their apt. I have not heard the noise recently, so perhaps it is fixed. But I wonder—even though water obviously flows down the drainpipe directly below the sink, could the pipes that send water to the sink originate in a totally different spot—if so, they could have been the ones that were banging, which would make sense. Thanks
We try to get the main pipes as close to fix. as you can it depends on the layout, the pvc waste pipe makes a noise when hot water is run into them they expand and if holes are to small in wood they make a noise.