{"id":1691,"date":"2025-06-02T11:00:00","date_gmt":"2025-06-02T16:00:00","guid":{"rendered":"https:\/\/www.relianceplumbing.com\/blog\/?p=1691"},"modified":"2025-06-03T13:09:25","modified_gmt":"2025-06-03T18:09:25","slug":"what-causes-knocking-water-pipes","status":"publish","type":"post","link":"https:\/\/www.relianceplumbing.com\/blog\/plumbing-service\/what-causes-knocking-water-pipes\/","title":{"rendered":"What Causes Knocking Water Pipes?"},"content":{"rendered":"
\n
\"copper-water-pipes\"<\/a><\/figure><\/div>\n\n\n

Have you ever turned off a faucet and heard a loud banging or knocking sound in your walls? This alarming noise is more than just an annoyance: it\u2019s often a sign of a common plumbing issue known as\u00a0water hammer. If your pipes are making strange noises<\/a>, it\u2019s important not to ignore them. Acting quickly can prevent more serious plumbing problems down the road.<\/p>\n\n\n\n\n\n\n\n

Understanding Water Hammer<\/h2>\n\n\n\n

Water hammer occurs when a valve or faucet is shut off quickly, causing the flow of water to suddenly stop. Because water is cannot be compressed, the abrupt halt in flow sends a shockwave through your plumbing system. This pressure wave can cause pipes to vibrate or bang against the walls, floor, or other plumbing components.<\/p>\n\n\n\n

Normally, air chambers or water hammer arrestors are built into the plumbing to absorb this shock and reduce noise. However, over time, these air chambers can fill with water or become less effective. Once this happens, the pipes can\u2019t absorb the pressure change, and that\u2019s when you start hearing the knocking sounds.<\/p>\n\n\n\n

Other Potential Causes of Noisy Pipes<\/h2>\n\n\n\n

While water hammer is the most common reason for knocking pipes, it\u2019s not the only one. Other possible culprits include:<\/p>\n\n\n\n