Prepare a sound, clean substrate; form drainage falls; prime if the system requires it; reinforce corners, joints, and penetrations; then apply the specified membrane coats at the correct thickness before flood testing and tiling.
This guide is written for South Africa, Australia, New Zealand. Always check local codes, product specifications, licences, and site conditions.
Step by step
Confirm the substrate
The base must be rigid, clean, dry enough for the selected system, and free from dust, oil, curing compounds, and loose material.
Create positive drainage
Form a consistent fall toward the waste so water cannot pond. Correct geometry before applying the membrane.
Detail changes of plane
Use compatible bond breakers, tapes, or reinforcement at corners, joints, wastes, and pipe penetrations as the manufacturer specifies.
Apply and verify
Apply the full system to its stated coverage and dry-film thickness. Allow curing, inspect for pinholes, then perform the required water test.
Expert tips
- Use one compatible system from primer through membrane.
- Photograph concealed waterproofing before tiling.
- Local codes may require licensed or certified waterproofing work.
Common questions
Do tiles and grout make a shower waterproof?+
No. Tile and grout are finish layers; the membrane behind or beneath them is the primary water-control layer.
How many coats of waterproofing are needed?+
Follow the selected system specification. Many liquid systems use two or more coats, but thickness and coverage matter more than a generic coat count.
Can I tile the same day?+
Usually not. The membrane must cure fully under the actual temperature and humidity conditions before it is covered.
Sources & further reading
We link to official building-code, government and public-health material where a technical or safety claim needs authoritative context. Local rules and adopted code editions can change.
- South African GovernmentNational Building Regulations and Building Standards Amendment ActSouth African building-control and approval framework.↗
- Australian Building Codes BoardWaterproofing in housesNational Construction Code overview for domestic wet-area waterproofing.↗
- New Zealand Building PerformanceBuilding Code: E MoistureOfficial requirements for surface water, external moisture and wet areas.↗
Stop if the work involves structural uncertainty, hazardous materials, heights, live services, gas, serious water damage, or regulated work. Local rules differ—use an appropriately licensed professional where required.