Torch on waterproofing price per m2
The torch on waterproofing price most South African cost guides quote for 2026 is R250–R450 per m² installed, with about R350/m² a common middle figure. That covers a 3–4 mm membrane, primer and labour on a sound slab. Typical torch on waterproofing prices go up when old layers must be stripped, cracks repaired or falls corrected.
Roof waterproofing cost by system
| System | Typical price per m² | Typical lifespan | Best for |
|---|---|---|---|
| Cold-applied bitumen | R100–R250 | 3–7 years | Budget, short-term |
| Cementitious coating | from ~R140 | 5–10 years | Below-ground walls, wet areas under tiles |
| Liquid membrane (acrylic, reinforced) | R150–R350 | 5–10 years | Detailed roofs, parapets, IBR laps |
| Torch-on membrane | R250–R450 | 10–15 years | Flat concrete roofs |
| Polyurethane (PU) | R350–R500 | 15–20 years | Balconies, trafficable roofs |
Extras that change your roof waterproofing cost
| Extra | Typical cost |
|---|---|
| Surface repair & priming | R30–R60 per m² |
| Screed to correct falls | R60–R100 per m² |
| Bathrooms, showers, pitched roofs, basements | 10–30% above flat-roof rates |
| Scaffolding / special access (multi-storey) | R5,000–R15,000 |
| Two-layer systems | Roughly double the membrane cost, longer life |
Ranges from the Ourpower 2026 waterproofing cost calculator. Real-world examples on Procompare include about R9,500 for a 22 m² torch-on balcony and about R85,000 for a 242 m² IBR roof in torch-on.
Example project prices
| Job | Typical range |
|---|---|
| Small leak repair (flashing, tiles, IBR screws) | A few thousand rand |
| Balcony, ~20 m², torch-on | ~R8,000–R10,000 |
| Flat roof, 100 m², torch-on with prep | ~R35,000–R45,000 |
| Large IBR roof, ~240 m² | ~R85,000 |
Torch on membrane price vs installed price
The torch on membrane price per roll at a hardware store is only part of the job. Primer, gas, detailing at outlets and parapets, a reflective coat, labour and the guarantee are what make installed pricing per m² the fair comparison. A cheap install that fails in two years costs more than doing it once properly.
How to compare quotes
- Same scope: is old membrane being stripped or overlaid?
- Same system: product, thickness and number of layers.
- Detailing: parapets, outlets, upstands and penetrations included?
- Guarantee: length and what voids it.
Get your own number: book a free on-site inspection. Related: torch-on waterproofing, roof leak repairs, torch-on vs liquid.