Most showers leak because the waterproofing system underneath the tiles has broken down. Once this layer fails, water seeps into the walls and floor where it causes hidden damage.
This guide explains the signs of waterproofing failure, why it happens, and what you should do next.
What Is Waterproofing and Why Is It Important?
Waterproofing is the membrane beneath the tiles that stops water entering the structure of your home.
A shower can look perfect on the surface, but if the membrane has failed, leaks will still occur.
Early Warning Signs of Waterproofing Failure
These signs often appear before a major leak:
1. Bubbling or peeling paint
Moisture moves into wall cavities and pushes the paint away from the surface.
2. Swollen skirting boards or door frames
Timber absorbs water and expands.
3. Drummy or loose tiles
Moisture weakens the glue or substrate beneath the tiles.
4. Mould that returns quickly
Cleaning removes the surface mould, but moisture behind the tiles brings it back.
5. Damp spots on walls adjacent to the shower
These spots often grow larger over time.
6. Water pooling around the base of the shower
This indicates poor drainage or water escaping beyond the shower zone.
If you notice even one of these issues, the waterproofing may be compromised.
Why Waterproofing Fails
There are several common causes:
- Age and natural deterioration
- Incorrect installation
- Movement in the building
- Poor preparation during construction
- Unsealed junctions and corners
- Cracked or deteriorated grout
Once the membrane is damaged, it does not repair itself. It continues to break down.
How Aquatech Checks for Waterproofing Failure
Aquatech uses specialised detection equipment to locate moisture and find the exact problem.
Thermal imaging
Highlights temperature differences caused by moisture.
Moisture meters
Measure the amount of water inside walls and floors.
Water testing
Helps identify the source of the leak.
A clear diagnosis ensures you receive the correct repair solution.
Repair Options if the Waterproofing Has Failed
Surface repairs
Suitable for minor leaks caused by worn grout or silicone.
Full shower rebuild
Needed when the waterproofing itself has broken down or the substrate has been damaged.
This involves:
- Removing tiles
- Installing a new membrane
- Reselecting grout (usually epoxy)
- Retiling and resealing
A rebuild restores the shower to a fully compliant, watertight condition.
Protect Your Home from Ongoing Damage
Waterproofing failure is not something to delay. The longer moisture spreads, the more expensive the repair becomes.
Aquatech Grouting provides expert leak detection, regrouting and full shower rebuilds across Brisbane and South East Queensland.
