Torch-on is the go-to system for flat and low-pitch concrete roofs in Cape Town: a bituminous membrane heat-welded to the surface in overlapping sheets. It's durable and long-lasting, but the quality of the install makes or breaks it. Here's what it costs in 2026 and how to compare quotes.
| Item | 2026 price | Notes |
|---|---|---|
| Torch-on membrane (supply & install) | R300 to R500 / m² | Heat-welded bituminous sheet on a prepared concrete roof. |
| Surface prep & crack repair | Often included; confirm | Lifting old membrane, repairs, priming, where the labour is. |
| Typical flat-roof job total | R8,000 to R30,000+ | Driven by roof area, prep, detailing and access. |
| Expected lifespan | 10 to 15 years | With a 5 to 10 year workmanship guarantee from reputable installers. |
These are indicative Cape Town market ranges for 2026 to help you compare, not a quote.
A fair torch-on quote covers lifting and disposing of the old membrane, repairing cracks and blisters, priming the slab, the membrane itself, and proper detailing at upstands, parapets and outlets, finished with a reflective UV coating. If prep and detailing are 'extra', the cheap rate isn't cheap.
Torch-on fails at the joints and upstands, not in the middle of a sheet. Correct overlaps, fully welded seams and properly dressed upstands are what keep it watertight for 15 years. This is a job for an experienced specialist with the right gear, a poorly torched roof can leak within a season and is a genuine fire risk during install.
Torch-on costs more up front (R300 to R500/m² vs R120 to R250/m² for acrylic) but lasts far longer on a flat concrete roof and handles ponding water better. Acrylic is cheaper, more flexible and easier to re-coat, which suits balconies and parapets. For a main flat roof, torch-on is usually the better long-term value.
In Cape Town in 2026, torch-on is roughly R300 to R500/m² supplied and installed on a prepared concrete roof. A typical residential flat-roof job totals R8,000 to R30,000+ depending on area, prep and access.
A properly installed torch-on system lasts about 10 to 15 years, and reputable installers back it with a 5 to 10 year workmanship guarantee. Lifespan depends heavily on the quality of the seams and upstand detailing and on a maintained UV coating.
Tell us about the problem and we'll connect you with one trusted local specialist for a free, no-obligation quote.