Bathroom Waterproofing in Norwood

Significant ones. Timber floor joists that are exposed to sustained moisture will rot — often invisibly from above until the floor structure is seriously compromised. In older Norwood homes where the subfloor is inaccessible, this can go undetected for years. If you have any signs of a leaking shower in a home with a timber floor — water stains, damp smell, tiles lifting — treat it as urgent. The cost of fixing the waterproofing is a fraction of what it costs to repair or replace rotted floor structure.

In the vast majority of cases, the tiles have to come off to access and repair the waterproofing membrane. We know this is disappointing, particularly if you have original tiles with character. We assess each shower individually — if the leak is localised to a grout joint or a seal around a fitting, there may be a targeted repair option. But if the membrane has failed, there's no reliable repair that doesn't involve removing tiles. We'll give you an honest assessment during the initial inspection.

Common signs include: water stains appearing on the wall or ceiling of the room below your bathroom; damp patches on walls adjacent to the shower; mould growth that keeps coming back despite cleaning; tiles that have come loose or grout that is cracking and falling out; a musty smell in or around the bathroom. If you notice any of these, don't delay — waterproofing failures get progressively more damaging and expensive the longer they are ignored.

Rarely. If the waterproofing membrane has failed, the tiles must come off to expose and repair the membrane. Some very early-stage grout failures can be addressed with penetrating sealers, but these are temporary measures, not permanent repairs. If water has penetrated to the substrate, no topical treatment will fix the problem — the tiles need to come off and the work needs to be done properly.

AS 3740 is the Australian Standard for waterproofing of domestic wet areas. It specifies exactly where membranes must be applied, to what heights, in how many coats, and what testing is required. All builders and waterproofers in Australia are required to comply with this standard. When we waterproof your bathroom, we comply fully with AS 3740 and can provide documentation confirming this — important if you ever sell your home or make an insurance claim.

A properly applied membrane system should last the life of the tiles — typically 20–30 years or more. The grout joints should be inspected and resealed every 5–7 years as part of normal maintenance. Failures are almost always caused by inadequate application (skipping coats, insufficient height on walls, or poor preparation) rather than the membrane materials themselves. This is why we never cut corners on waterproofing application.

Waterproofing scope varies significantly depending on the size of the wet area, the extent of substrate repair required, and whether this is a standalone waterproofing repair or part of a full renovation. We don't publish pricing online because every situation is different. Contact us for a written quote after we've assessed the specific situation — it's the only way to give you an honest number.

Technically, homeowners can apply waterproofing products themselves in South Australia. However, if the waterproofing is done incorrectly and subsequently fails — causing damage to the structure — home insurance claims may be affected if the work wasn't done to AS 3740 by a competent person. Licensed builders who apply waterproofing must do so to the standard and can certify their work. Given waterproofing is the most consequential layer in a bathroom, this is one area where we'd strongly recommend using a qualified tradesperson.