Do wet rooms leak?
Properly built wetrooms do not leak — the membrane systems are proven technology. The horror stories come from installation shortcuts: tanking only the shower corner, skipping the flood test, or ignoring movement in timber floors. Ask any installer one question: do you flood-test before tiling?
When a wetroom fails, the failure is almost never the membrane product — modern tanking systems are boringly reliable. It is the installation: partial tanking that stops where the installer decided the 'wet zone' ended, penetrations (pipe holes, drain edges) sealed casually, no movement accommodation where timber meets masonry, or falls formed wrong so water sits against an upstand for years.
South London's housing stock raises the stakes: most of our wetrooms go into suspended timber floors in Victorian and 1930s houses, and timber moves seasonally. The membrane system has to be specified for that — decoupling, flexible sealants at junctions, movement joints in large tiled runs. A general tiler using a bathroom-corner tanking kit is not building the same thing.
Our process makes the guarantee checkable: full-room membrane, photographed; every penetration collared and sealed, photographed; then the floor is plugged and flooded for 24 hours before a single tile goes down. If it holds — and it does — you get the photos with your paperwork. That flood test is the single question that separates wetroom builders: ask it of anyone quoting you.
More in wetrooms & showers, or browse all 38 questions on the FAQ index.
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