I have a 2-storey house. When the shower is turned on upstairs, the whole
house vibrates, and the noise is mind boggling. When I turn off the water,
I hear a "thump."
What could be the problem(s)?
Look for a loose washer either in the shower controls or maybe
even in a shut off valve.
Another possibility is a toilet ballcock causing a resonance.
You can check that by closing the supply stops to the toilet(s).
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