A ceiling leak can come from plumbing, a roof, waterproofing, an air-conditioning drain or water travelling from another part of the building. The immediate priorities are electrical safety, preventing collapse and limiting further damage.
Treat a bulging ceiling as unstable
Waterlogged ceiling boards can fail suddenly. Keep people and pets away and do not stand beneath a sagging area.
Consider electrical hazards
If water is near lights, wiring or electrical fittings, avoid touching switches or wet surfaces. Isolate the affected circuit or main supply only if it is safe to do so and contact the appropriate professional.
Control the water source
If the leak is linked to a plumbing fixture or pressurised pipe, close the local valve or main water supply. For roof ingress, contain water and arrange roof assessment when conditions are safe.
Protect the room below
Move furniture and electronics, place containers under drips and use plastic sheeting where practical. Do not create unsafe trip hazards.
Possible plumbing sources
Bathrooms above, geysers, supply pipes, waste pipes and overflowing fixtures are common causes. Note whether the leak appears after showering, flushing or using hot water.
Roof and waterproofing clues
Leaks associated with rain may result from roof coverings, flashings, gutters or failed waterproofing. Water can travel along rafters before staining the ceiling.
Why the stain may not mark the source
Water follows gravity and structural paths. The entry point can be several metres away from the visible mark.
Drying and mould prevention
Removing the source is only the first step. Wet insulation and ceiling cavities may require ventilation, dehumidification or controlled removal to dry properly.
Document before repairs
Photograph the ceiling, water path, damaged contents and suspected source. Keep invoices and professional reports where insurance may be involved.
Frequently asked questions
Should I puncture a bulging ceiling?
Doing so can release a large volume of water and cause collapse or electrical danger. Keep clear and let a qualified person assess it.
Why does the ceiling leak only after a shower?
Possible causes include a leaking waste, failed seal, waterproofing defect or supply connection in the bathroom above.
Can a plumber repair every ceiling leak?
Plumbers handle plumbing sources. Roof, waterproofing, electrical and ceiling repairs may require other trades.
Need help with an active ceiling leak?
Keep clear of unstable boards and electrical fittings, isolate the water where safe and call us with details of what is above the affected area.