Shared plumbing between laundry room and bathroom - trouble?
The house I've recently moved into has a laundry room set up next to a bathroom on the second floor. Because the house is about 100 years old, it's obvious that the water inlets and drains are retrofits but since all piping is behind walls, I can't say much else from appearance.
However, when one flushes the toilet in the washroom, you can hear the trap in the laundry room gurgle and there's an obvious pressure change when the water is running one room and then turned on in the other room. So clearly, these two rooms share the same plumbing in one form or another.
My new concern is that I just installed a new washing machine and noticed that when the toilet is flushed or the water is run in the bathroom, the water hoses into the washing machine jostle a little (even if the machine is not running) as if some water or pressure is being pulled from the hoses in order to run the toilet or bathroom sink. Is this normal? Can it damage the washing machine?
Also, while the whole house has great water pressure (including the washing machine inlets) the connected bathroom has pretty poor pressure.
Having looked at some of the other changes that the previous owners made to this house, I would imagine that the piping retrofit was a bit of a DIY hack job and I would like to correct it if possible (and assuming it's actually a problem). Is there anything you can suggest as a fix (again assuming one is needed) that would be possible for a plumbing novice like myself? If it's at all possible to fix this problem without bringing down a wall that too would be nice.
Thanks in advance for your help.