Plumbing causes come first because they run continuously. A slow leak on a supply line, a leaking waste, or a failed seal under a shower or bath will keep a subfloor wet regardless of weather. The distinguishing feature is that the dampness does not vary with rain.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
