Substrate inspection
Checking sheeting, fixing, rigidity, falls and moisture before any membrane is applied.
The layer you never see
Bathroom Waterproofing Brisbane
Bathroom waterproofing in Brisbane to AS 3740, with flood testing, documented application and compliance certificates. Call (07) 8590 6941.
- QBCC licensed builder
- Fixed written scope
- Waterproofing certificate
- One accountable team
Bathroom Waterproofing across Brisbane. Call (07) 8590 6941 or request an on-site measure and written quote.
QBCC licensedBuilder restricted to kitchen, bathroom and laundry
AS 3740 waterproofingCertified membrane and compliance documentation
One accountable teamEvery trade coordinated from strip-out to handover
Fixed written scopeClear inclusions, allowances and variations
The layer you never see
Bathroom Waterproofing in Brisbane, scoped properly
StandardAS 3740 domestic wet areas
DocumentationCompliance certificate
TestingFlood test before tiling
Best forRenovations and rectification
Waterproofing is the most important part of a bathroom and the only part you will never see again. When it fails, the damage appears somewhere else: a stained ceiling, a lifted tile, a musty smell or a rotting floor. By then the cost is no longer just a membrane. We treat waterproofing as a documented construction stage, not a quick coat before the tiler arrives.
Our waterproofing work follows AS 3740, the Australian standard for waterproofing of domestic wet areas. That includes correct substrate preparation, bond breakers at junctions, reinforcing to corners and penetrations, the specified membrane thickness, cure times and flood testing before tiling. We photograph the application and provide a compliance certificate at completion.
We waterproof full bathrooms, ensuites, laundries, balconies and commercial wet areas across Brisbane. If you are managing another builder or tiler, we can also provide a standalone waterproofing service with clear responsibility for the membrane and documentation.
What is included in our bathroom waterproofing scope
Every project is different, but the following scope is the foundation we price and manage. Your written quote confirms exactly what applies to your room, including any exclusions and provisional allowances.
Surface preparation
Cleaning, sanding, filling, priming and installation of fillets and bond breakers at junctions.
Junction reinforcement
Tape and membrane reinforcement to internal corners, wall/floor junctions, waste outlets and penetrations.
Membrane application
Two or more coats of compatible membrane at the specified coverage, with thickness checks.
Shower and bath detailing
Upstands, hob details, niche waterproofing and bath-to-wall junctions sealed and reinforced.
Flood testing
Contained water test for the required period, with results recorded before tiling proceeds.
Certificate and records
Compliance certificate, product data and photographs of the completed membrane.
Rectification
Removal of failed membranes, investigation of the water path and rebuild of the affected wet area.
How we approach bathroom waterproofing
Water finds the weakest junction
Most failures start at a corner, a waste, a niche or the junction between a shower base and wall. We reinforce those details and make sure the membrane is continuous rather than relying on silicone to solve a geometry problem.
Falls must work before the membrane
A membrane cannot fix a floor that falls the wrong way. We check the screed and adjust it before waterproofing so water reaches the waste. If the fall is inadequate, we correct it rather than tiling over the problem.
Cure times are part of the programme
Membrane systems have specified recoat and cure windows. We schedule them properly and do not let tiling start early to save a day. Rushing the membrane is one of the most common causes of avoidable failure.
Documentation protects everyone
A certificate is not paperwork for its own sake. It records who applied the membrane, to what standard, and when. It matters for insurance, resale and any future warranty claim. We provide it as standard.
Bathroom Waterproofing cost guide
Waterproofing is priced by area, access and the complexity of details. A straightforward bathroom is typically a small proportion of the overall renovation cost.
| Scope | Indicative range |
|---|---|
| Bathroom or ensuite membrane | $2,500 – $4,500 |
| Laundry or small wet area | $1,800 – $3,200 |
| Balcony or larger wet area | $3,500 – $7,000 |
| Failed membrane rectification | Quoted after investigation |
Pricing assumes clear access and sound substrate. Re-sheeting, screeding and tile removal are additional if required. For a fuller breakdown, read our Brisbane bathroom renovation cost guide or use the cost calculator.
Our bathroom waterproofing process
One project lead manages the sequence, checks each trade's work and keeps you informed. The programme is agreed before demolition so you know when to expect each stage.
Inspect
We check the substrate, falls, junctions and moisture before confirming scope.
Prepare
Surfaces are cleaned, repaired, primed and reinforced at every junction and penetration.
Apply
Membrane is applied in the specified coats with thickness and coverage checked.
Test
The floor is flood tested and the result recorded before tiling.
Protect
The membrane is protected from trade damage until tiles are laid.
Certify
Compliance certificate and records are issued at completion.
Why homeowners choose our team
We are the builder. The team who quotes your project is accountable for the waterproofing, tiling, trade coordination and handover. That direct responsibility is why our scope can be specific and our programme realistic.
- QBCC licensed for kitchen, bathroom and laundry work, with Certificate III qualifications in tiling and waterproofing.
- AS 3740 waterproofing with flood testing and a compliance certificate.
- Externally ducted ventilation and moisture-aware detailing for Brisbane's climate.
- Written variations, agreed before the work proceeds.
- A formal handover with testing, care instructions and documentation.
If you are comparing quotes, read our guide to choosing a bathroom contractor and our contractor standards so you know what to ask.
Bathroom Waterproofing across Brisbane
We work across Greater Brisbane, including the northside, southside, eastside, westside and inner city. Local housing conditions affect the scope: older Queenslanders may need floor levelling and substrate repair, while apartments need body corporate approval and careful access planning.
ChermsideAspleyGeebungCoorparooCarindaleMorningsideYerongaSunnybank HillsForest LakeIndooroopillyToowongThe GapSpring Hill
Not sure which page applies to you? Call us with your suburb and we will point you to the right local information and confirm service availability.
Practical answers
Bathroom Waterproofing questions
The questions Brisbane homeowners ask most often about bathroom waterproofing, costs and timing.
Why do I need a waterproofing certificate?
A certificate documents that the wet area was waterproofed to AS 3740 by a competent applicator, with the products and dates recorded. It supports insurance, resale and warranty claims, and gives you evidence if a future issue arises.
How long does waterproofing take?
Application is usually completed in a day or two, but cure times before tiling can add another day or more depending on the product and conditions. We include those times in the programme rather than compressing them.
Can you waterproof over existing tiles?
Generally no. A reliable membrane needs a sound, prepared substrate. Tiling over an existing floor usually hides the condition of the original waterproofing and creates height and adhesion problems. We recommend removal and rebuild in most cases.
What is a flood test?
The shower or wet-area floor is dammed and filled with water for a specified period to check that the membrane holds and the fall directs water to the waste. We record the test before tiling.
Do you waterproof balconies and laundries?
Yes. We waterproof domestic wet areas including bathrooms, ensuites, laundries, balconies and roof terraces, subject to the relevant standard and substrate requirements.
My shower is leaking into the ceiling below. What now?
Stop using the shower and arrange an inspection. The source may be the membrane, a failed waste seal, grout or plumbing. We investigate before quoting so the repair addresses the cause rather than just the visible damage.
Get started
Ready to price your bathroom waterproofing?
Call (07) 8590 6941 for a straightforward conversation, or send your details and we will arrange an on-site measure and written quote.