What to understand about bathroom waterproofing in Perth
Bathroom waterproofing is a membrane applied over the prepared floor and walls before tiling, so water from the shower and floor stays out of the structure. For homes, AS 3740 sets out how domestic wet areas are waterproofed, and NCC 2022 is the building code that relies on it.
Who this bathroom guide suits
Perth homeowners at three points: planning a renovation, stripped back to the slab or frame, or building a new bathroom. Each stage changes the job. A strip-out shows what sits under the old tiles, while a new build lets the membrane be planned with the falls and drains from the start.
Which bathroom zones need membrane
The shower recess floor and walls get the fullest treatment. Beyond the shower, the floor, wall and floor junctions, the bath surround and every pipe and drain penetration are addressed, with the extent set by the floor substrate and shower type. A good scope names each zone instead of saying the bathroom is done.
Cure time, sequence and flood testing
A membrane has to cure before tiles go down, and that time comes from the product's data sheet rather than a rule of thumb. Cool, damp Perth winters can slow curing. A flood test holds water on the cured membrane to show it is watertight before tiling covers it for good.
Why the tiler or waterproofer decision matters
The trade name matters less than the result. Whoever applies the membrane should be licensed and insured, use a compliant product and issue a waterproofing certificate when the work is finished. Ask who signs off the membrane, and keep that certificate with your renovation records.
What a written scope should list
The zones covered, the membrane product, preparation and priming, how junctions and penetrations are treated, the cure time allowed, whether a flood test is included and the certificate on completion. If any of these is missing, ask about it before work starts.
Next step for your bathroom
Note the room, where the renovation is up to (planning, stripped out or ready for membrane) and your suburb. Plans and measurements are optional. Photos of the bare floor and shower base are useful if you have them, as they show the substrate a licensed and insured local contractor will be working over.
Bathroom Waterproofing Services We Offer
✓Renovation Strip-out Membrane
A fresh membrane after old tiles and failed waterproofing are removed and the substrate is repaired.
✓New Bathroom Membrane
Waterproofing planned with the falls, drains and wall linings of a new build or extension.
✓Shower Recess Membrane
Floor and wall waterproofing focused on the shower area when the rest of the room is staying.
How it works
- 1
Check the room and stage
The bathroom is looked at for where the renovation is up to, the floor substrate, the shower type and any signs of past leaks.
- 2
Prepare and prime
Surfaces are cleaned, repaired and primed, and junctions, corners and penetrations are detailed so the membrane bonds properly.
- 3
Apply and cure the membrane
The membrane goes on to the zones in the scope at the product's specified thickness, then cures for the time on its data sheet.
- 4
Test and certify
Where included, a flood test confirms the membrane is watertight, and a waterproofing certificate is issued before tiling begins.