If your water pipes are banging or making knocking noises when no water fixtures are currently turned on, the issue is rarely a classic water hammer. Instead, it is typically caused by thermal expansion and contraction, where long runs of copper or PEX supply pipes expand and rub against framing holes or joists as hot water cools down inside the lines. Alternatively, a faulty pressure-reducing valve (PRV) or a neighbor's plumbing activity can transmit vibrations. Verification: Inspect pipe hangers and check if banging correlates with heating cycles or hot water use.
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