New build waterproofing Cape Town is about getting it specified and sequenced correctly the first time, when everything is still accessible and nothing has to be broken out to fix it.
Retrofitting into an existing building is covered under renovation waterproofing. Systems sit under Waterproofing Cape Town.
Send the area involved and photos of the surface as it stands. That is usually enough to price it.
Get a QuoteWhere It Goes Wrong on New Builds
- Slab not cured. Membrane laid over construction moisture blisters within a season.
- Falls never built in. A level slab with no fall, so the membrane holds water permanently.
- Below-ground done last. External tanking is far cheaper before backfilling than after.
- Wet areas rushed. Tiling booked before the membrane has cured or been tested.
- Penetrations added later. Services drilled through a finished membrane without making good.
- No flood test. The cheapest quality check on site, and the one most often skipped.
Sequence That Avoids Rework
- Specify systems at design stage, matched to substrate, exposure and what sits below.
- Tank below-ground walls externally before backfilling.
- Allow the slab to cure and confirm with a moisture reading, not a calendar.
- Build falls into the screed towards outlets that are already set at the right level.
- Waterproof wet areas, with reinforcing tape at every junction and collar at every penetration.
- Flood test wet areas and decks before any finish goes down.
- Protect the membrane through the rest of the build.
New Build Waterproofing Cape Town Prices
| Job | Indicative range | What moves it |
|---|---|---|
| Torch-on membrane, single layer | R300 – R400 per m² | Flat and low-slope roofs. |
| Torch-on, double layer | R400 – R550 per m² | Base sheet plus mineral cap. |
| Cementitious slurry | R180 – R420 per m² | Two coats, brush or roller applied. |
| Screed to correct falls | R250 – R600 per m² | Where water is ponding. |
| Tanking, negative side | R400 – R1,500 per m² | System and preparation. |
| Penetration or collar detailing | R650 – R1,800 each | Number and type. |
| Wet area waterproofing | R4,500 – R12,000 | Per bathroom or shower. |
| New or relocated roof outlet | R1,800 – R4,500 each | Including membrane detailing. |
| Commercial project | From R25,000 | Scoped on area and access. |
These are indicative market ranges, not a quotation. They are compiled from published South African waterproofing and roofing pricing to give you a starting point for budgeting. They are not the rate card of any company on this platform.
Compare quotes on the system specified, the number of coats, what preparation is included and what the guarantee covers. A rate per square metre means nothing until you know what the rate covers.
Compare quotes on what is included, not on the total alone.
Request QuotesProtecting Work Already Done
A large share of new build waterproofing failures are caused by other trades after the membrane went on: scaffolding dropped on a deck, services drilled through a slab, or a screed laid over a punctured sheet.
Protection boarding and a written handover point between trades cost very little and prevent the most expensive category of defect on site.
Related Services
Frequently Asked Questions
How long should a new slab cure before waterproofing?
Long enough that a moisture reading confirms it, rather than a fixed number of days. Thickness and conditions both affect it, and laying a membrane over construction moisture causes blistering within a season.
Is external tanking worth it on a new build?
On below-ground walls, considerably. Applying it before backfilling is far cheaper and more effective than retrofitting an internal system later, and it is one of the few waterproofing decisions that is genuinely difficult to reverse.
Do I need the leak found before the work is quoted?
If there is an active leak, yes. Water enters at one point and shows at another, so coating the stained area often misses the entry point entirely.
Is this covered by insurance?
Insurers generally cover sudden damage rather than gradual failure. A system at the end of its life is normally treated as wear and tear, and storm damage is a separate question your policy wording decides.
How many quotes should I get?
Three or more, on the same written brief. Rates vary widely because scope varies widely, and a spread of quotes shows quickly which contractor has actually inspected the job.
How long does the work take?
A domestic-scale job is often two to four days including preparation and curing. Larger or multi-section work runs one to three weeks. Rain stops work entirely.
Request a Waterproofing Quote
Describe the job and get quotes back from companies in your area.
Free to use, no obligation. Your request goes to LEADERR APPROVED waterproofing companies covering your area, who quote you directly.
Client Reviews
Powered by leaderr
