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Water hammer
Water hammer is a banging or thumping in pipes when water flow stops suddenly.
Why it matters
It can damage valves and fittings and it can loosen connections over time.
Where people get this wrong
It is not always a loose pipe. Pressure and fast-closing valves can cause it. It can get worse after new fixtures are installed.
Real-world example
You shut off a faucet and the wall thumps like someone kicked it. The pipes are complaining about a sudden stop.
Where this hits your build
This comes up during rough-in and final fixture installation. Accessibility for future repairs matters as much as the initial install.
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