The classic three are a warm patch on a hard floor over a hot line, a water meter that keeps moving with every fixture off, and a monthly bill that jumps without a change in use. Softer signs follow: laminate or wood that feels spongy along one wall, a musty smell in a room with no plumbing fixture, and the sound of running water in a quiet house at night. On a slab home these signs justify a detection visit on their own, because the leak is damaging the floor system for every week it runs unnamed.
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