Roof Waterproofing Cost depends on the system, the area and how much preparation the surface needs first. Here are typical per square metre prices for the systems South African contractors use.
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Get Roofing QuotesWaterproofing Prices per m²
Ballpark prices so you can sanity-check a quotation.
| System or item | Ballpark price |
|---|---|
| Cementitious coating | About R140 per m² |
| Acrylic or bitumen coating | R100 - R180 per m² |
| Cold-applied bitumen | R100 - R250 per m² |
| Liquid membrane | R150 - R350 per m² |
| Torch-on membrane | R250 - R500 per m² |
| Polyurethane | R350 - R500 per m² |
| Surface repairs and priming | R30 - R60 per m² |
| Screed to correct ponding | R60 - R100 per m² |
| Parapet wall waterproofing | R3,000 - R8,000 |
Prices JUST UPDATED. Indicative ballpark figures in rand, rounded, based on typical South African market rates. They are not our prices or quotations, and no contractor is bound by them. Ask whether VAT is included, and check what each quotation covers, such as scaffolding, rubble removal and call-out fees.
Choosing a System
- Torch-on membrane. Durable choice for concrete flat roofs.
- Liquid membrane. Seamless, good around complex details and pipes.
- Acrylic or bitumen coating. Lower cost, often over existing systems.
- Polyurethane. Tough and flexible, for balconies and trafficked areas.
What Affects the Price
- System. Torch-on and polyurethane cost more than coatings but last longer.
- Preparation. Removing failed membranes, repairing cracks and priming add to the rate.
- Falls and ponding. Screed to fix standing water adds R60 - R100 per m².
- Layers. Two-layer systems cost roughly double the membrane rate.
- Access. Multi-storey buildings may need scaffolding at R5,000 - R15,000.
What a Quotation Should Include
- Area. Square metres, including upstands and parapets.
- System. Product, thickness, number of layers and finish coat.
- Preparation. Stripping, crack repairs, priming and screed.
- Details. Outlets, flashings, pipes and edges.
- Guarantee. Workmanship guarantee in writing and any product guarantee.
Compare written quotes for the same scope. Describe the job once and get the best quote, fast.
Get Roofing QuotesFrequently Asked Questions
Should old torch-on be removed first?
If it is lifting, blistered or trapping water, yes. Sound membranes can sometimes be overlaid after preparation.
How often does a flat roof need waterproofing?
Coatings need attention more often than torch-on. Annual inspections catch problems early.
Why is my quote higher than the per m² rate?
Small areas often carry a minimum charge, and preparation, upstands and access are priced on top.
Can waterproofing stop a leak from a pitched tile roof?
Usually not. Tile roofs leak through broken tiles, flashings and valleys, which need repair rather than a membrane.
Related Services
Request waterproofing quotes through Roof Repairs South Africa and compare systems and preparation side by side.
Roof Repairs South Africa is a lead-generation and quote-comparison service. We do not carry out roofing work and we do not employ roofers. Work is quoted and carried out by independent contractors, and your agreement is with the one you choose. Get a written quotation, check insurance and workmanship warranties, and avoid paying the full amount upfront.
Get the Best Quote, Fast
Keep it brief. Say what needs doing, where the property is and how to reach you. Your enquiry is passed only to roofing contractors suited to the job, and you decide whether to go ahead.
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