A wet patch on a ceiling is one of the clearest indicators of a leak in the floor above, typically involving a bath or shower waste, basin trap, washing machine connection, central heating pipework or a roof or balcony defect. The shape, position and colour of the stain help engineers narrow down the source before any opening up is needed. In flats across London, leaks from the property above are a frequent cause and may involve the building's freeholder, leaseholder and insurer in resolving responsibility. Building Regulations Part H1 and BS EN 12056 set out installation standards for sanitary plumbing. Engineers usually address common causes by isolating each potential source in sequence, sometimes using thermal imaging or moisture meters. Repair work should be followed by drying and reinstatement of the affected ceiling.
Wet patch on ceiling
Damp staining on a ceiling caused by water leaking from drainage or supply pipework above.
