Pipes make a loud banging noise when water is turned off due to hydraulic shock, commonly known as water hammer. When a high-velocity stream of water is rushing through a plumbing pipe and a valve or appliance shuts off abruptly, the moving water slams against the closed barrier. Because water is virtually incompressible, this sudden halt generates a powerful shock wave that reverberates backward through the pipe network, causing violent banging against framing studs. Verification: Install mechanical water hammer arrestors near fast-closing valves to absorb the shock wave.
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