Silicone is used at movement joints, meaning the junctions where two surfaces meet and can move independently: wall to floor, around a bath edge, around a shower base, and at fixture penetrations. Grout is rigid and cracks at these points, which is why flexible sealant belongs there instead.
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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.
