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    Repiping Guide

    Water Hammer and Pipe Support Problems

    A loud bang when a valve closes is the sound of water stopping abruptly. Water hammer is common, and it's usually a support or valve issue — not a reason to repipe.

    Water hammer comes from pressure spikes when flow stops suddenly. The fix usually involves securing pipes, addressing valve behavior, or adding an arrestor — assessed before any replacement.

    What Causes the Bang

    When a valve closes quickly — like a washing machine fill valve or a fast-closing faucet — the moving water stops abruptly. That sudden stop creates a pressure spike that travels back through the pipe, producing the bang or shudder you hear.

    Loose pipe supports let the pipe move with that spike, which makes the noise louder and can loosen joints over time.

    Pipe Support and Securing

    Pipes should be secured at proper intervals so they don't move when pressure changes. Loose or missing supports let the pipe shift, amplifying water hammer and stressing connections.

    An assessment checks whether pipes are properly secured and whether existing air chambers or arrestors are functioning.

    When It's More Than Noise

    • Repeated loud bangs can loosen joints over time
    • Pressure spikes can stress fittings and valves
    • Securing pipes and adding arrestors addresses the cause
    • An assessment confirms whether supports or valves are the issue

    Hearing a Bang When Valves Close?

    An assessment can determine whether the cause is pipe support, valve behavior, or something else — before it leads to damage.

    Request an Assessment

    Or call: (833) 658-8144

    Frequently Asked Questions

    Related Reading

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    America's Best Plumbing 1 LLC provides plumbing service calls and project assessments for sewer lines, repiping, and water heaters.

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    Van Nuys, CA 91405

    (833) 658-8144

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