Waterproof membrane repair & replacement Cape Town answers the question most owners actually have: is this membrane worth patching, worth coating over, or does it need to come off?
Getting that decision wrong is the most expensive mistake in waterproofing, because coating over a failed membrane means paying twice. 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 QuoteReading the Membrane
| What you see | What it means |
|---|---|
| Isolated split or puncture | Patch. The rest of the membrane still has life. |
| Open seams in a few places | Re-weld or patch those seams, then reassess in a season. |
| Blistering across the roof | Moisture trapped underneath. Overlay will fail; investigate before deciding. |
| Crazing and granule loss | Surface ageing. Often a candidate for overlay if the sheet is still sound. |
| Reinforcement visible widely | End of life. Replacement rather than repair. |
| Membrane lifting at upstands | Detail failure. Repair the detail, which is often the whole problem. |
| Repairs needed every season | Replacement is cheaper across five years than repeated patching. |
The Overlay Question
An overlay costs far less than a strip and re-lay, which makes it attractive. It only works where the existing membrane is dry, well bonded and chemically compatible with what is going on top.
The risk is trapped moisture. A membrane holding water underneath will blister the new layer from below, and the failure appears within a season or two. A core sample or moisture survey is the way to answer that rather than guessing from the surface.
Waterproof Membrane Repair & Replacement Cape Town Prices
| Job | Indicative range | What moves it |
|---|---|---|
| Localised membrane patch | R2,000 – R6,000 | Isolated failure. |
| Full membrane replacement | R380 – R650 per m² | Strip, prepare and re-lay. |
| Strip failed membrane | R60 – R150 per m² | Including removal from site. |
| Torch-on membrane, single layer | R300 – R400 per m² | Flat and low-slope roofs. |
| Liquid-applied system | R140 – R400 per m² | Coat count and reinforcement. |
| Screed to correct falls | R250 – R600 per m² | Where water is ponding. |
| Parapet and upstand detailing | R250 – R550 per linear metre | Height and complexity. |
| Leak trace and inspection | R750 – R2,500 | Area, access and testing time. |
| Condition survey and report | R4,500 – R25,000 | Building size and detail. |
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 QuotesWhat Full Replacement Involves
- Strip the existing system back to the structural deck, removing everything from site.
- Assess the substrate now that it is visible, including cracks and any spalling.
- Correct falls where water was standing.
- Prime, then re-detail every upstand, outlet and penetration.
- Lay the new system with reinforcement at joints and movement details.
- Flood test before anything goes back over it.
Related Services
Frequently Asked Questions
Can a new membrane go over an old one?
Only where the existing membrane is dry, well bonded and compatible. If it holds moisture, the new layer blisters from underneath within a season or two. A core sample or moisture survey answers that properly.
When is patching no longer worth it?
When repairs are needed every season, when reinforcement is visible across the roof, or when blistering is widespread. At that point replacement costs less over five years than continuing to patch.
When should waterproofing be booked in Cape Town?
Late summer or autumn. Membranes and coatings need a dry substrate and a dry curing window, and contractors fill up as soon as the first winter fronts arrive.
Can waterproofing be applied over the existing coating?
Only where the existing layer is sound, dry and compatible. Coating over a blistered or delaminating membrane traps moisture underneath and the new work fails early.
What should the quote specify?
The measured area, the system and product by name, the number of coats or layers, the preparation included, how upstands and outlets are detailed, access equipment, the guarantee term and the exclusions.
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.
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