Start with the right scope.
Wet area waterproofing protects the structure below bathrooms, laundries, kitchens and other regularly wet internal spaces. The membrane is only one part of the system; falls, wastes, corners, penetrations, door thresholds and wall-to-floor junctions all need to work together.
We assess the substrate and room layout before setting out the waterproofing sequence, including preparation, detailing, membrane coverage and protection before finishes are installed.
On commercial and strata sites, coordination with other trades and clear records at each stage help prevent critical details from being covered before they are checked.
Where this work fits.
Wet area waterproofing protects bathrooms, amenities, laundries, cleaner rooms, commercial wet rooms and back-of-house spaces before tiles or finishes hide the risk. It matters in Sydney fit-outs, strata bathrooms, hospitality venues, gyms, schools, offices and medical suites where leaks can affect tenants below and create expensive access problems.
How to choose the right option.
The membrane is only as good as the substrate, bond breakers, penetrations, drainage falls and protection before tiling. A perfect-looking tile finish can hide poor waterproofing.
Confirm AS 3740 requirements, hold points, product compatibility and curing times before the tiler or flooring trade is booked.
What to send before we quote.
The fastest way to get useful advice is to send a clear brief. You do not need to diagnose the whole problem yourself, but you can help the contractor avoid guesswork.
- Send the site address and the best access point, especially for CBD, strata or industrial estates.
- Share photos of the affected area, the surrounding area, drains, cracks, thresholds, joints, stains and any previous repairs.
- Explain when the issue appears: after storms, during washdowns, after tenant use, or constantly.
- For epoxy flooring, describe forklift traffic, vehicle traffic, chemicals, washdowns, operating hours and shutdown windows.
- For waterproofing, note whether the area is internal, external, below-ground, exposed, tiled, trafficable or covered by other finishes.
- Tell us who needs documentation: builder, certifier, strata committee, facility manager, insurer or owner.
That information helps narrow whether the work is a straight wet area waterproofing scope or part of a wider commercial job involving commercial waterproofing, strata remediation, balcony waterproofing or epoxy flooring in adjacent service areas.
Common questions about wet area waterproofing.
What areas need wet area waterproofing?
Bathrooms, showers, laundries, amenities, cleaner rooms and other wet-process spaces may need waterproofing depending on the design and use.
What standard applies to bathrooms?
AS 3740 is the key standard for waterproofing internal wet areas in Australia.
Can wet area waterproofing be rushed?
Rushing is risky. Preparation, primer, coats, curing and protection all need enough time before finishes are installed.
Do commercial amenities need different thinking?
Yes. Higher traffic, cleaning chemicals, floor wastes, partitions and access programs can change the membrane and detailing approach.
Can you waterproof over existing tiles?
Sometimes there are overlay options, but the existing surface, heights, drains and failure cause need to be assessed first.
Do you provide documentation?
For commercial and strata work, photos, product details and handover notes can be included with the job records.
Ready to scope it?
Call Zac or send the job details. We will come back with a clear next step for your waterproofing or epoxy flooring project.