Possible signs of failed shower waterproofing include damp or staining that returns after shower use, swollen skirtings, loose or cracked tiles, a musty odour, mould, or moisture in an adjoining room or the ceiling below. These signs do not prove the membrane has failed because a leaking supply pipe, waste connection, fixture or seal can look similar. Stop using the area where practical, protect nearby belongings and arrange a professional inspection.
Limit Further Damage
- Stop using the suspected shower, balcony or other source area where practical. If rain is involved, protect the room below. Do not climb onto a wet roof or approach an unsafe edge.
- If a plumbing leak is suspected, stop using the affected fixture. Only close the property’s main water valve if you know where it is and can reach it safely; do not dismantle fittings or enter a meter pit.
- Move furniture and belongings away from damp areas. Place a container beneath a drip only when the ceiling is stable and there is no electrical risk.
- Take dated photos and videos before cleaning or disturbing finishes. Record dripping, stains, swollen skirtings, lifted tiles and cracked joints, including rooms above, beside and below the damage. Keep the evidence in case you need to establish whether a waterproofing warranty applies in NSW.
- Do not paint, seal, drill into or demolish the affected area before inspection. These actions can conceal the leak path, trap moisture or create additional hazards.
Keep away from sewage or contaminated water, sagging ceilings and wet electrical fittings. Do not touch wet switches, power points, appliances or switchboards. Call 000 if there is an immediate threat to safety.
Identify the Source
A professional should determine whether the water comes from failed waterproofing, a leaking water or waste pipe, a fixture, drainage, roofing or another building defect. Water can travel behind tiles and along walls, floors or structural elements, so its appearance does not reliably identify its source.
Where plumbing or drainage may be involved, a licensed plumber should inspect and test those systems. If they are excluded, an appropriately qualified waterproofing or building professional can assess the membrane, junctions, penetrations, falls and drainage details. Moisture mapping or any destructive investigation should be left to the relevant professional.
Arrange the Repair
The repair should address both the confirmed source and any hidden moisture. Depending on the system, access and extent of failure, the work may involve:
- repairing a plumbing or drainage fault separately
- removing finishes to access the failed area
- repairing or replacing the waterproofing membrane
- drying the substrate and cavity adequately
- removing water-damaged materials where necessary
- testing or inspecting the repair before reinstating finishes.
A localised membrane repair may be possible, but widespread or inaccessible failure can require replacement. That decision should follow inspection rather than relying on surface resealing. The repair proposal should also identify the waterproofing standards and certification that apply in NSW.
If the source is unclear or plumbing may be involved, contact our licensed leaking shower plumbers to inspect the plumbing and drainage before waterproofing repairs begin.