Why waterproofing matters in SA
Highveld thunderstorms, coastal salt air and harsh UV all attack roofs. Waterproofing is the barrier that keeps water out of flat roofs, parapets, box gutters and balcony slabs — the spots most prone to leaks.
Common waterproofing systems
- Torch-on (bituminous membrane). Heat-welded sheets, very durable. Best for flat concrete roofs. Lasts 10–15 years. ~R200–R350/m².
- Acrylic / liquid membrane. Painted-on, flexible, reflective. Good for general roofs and re-coats. Lasts 5–10 years. ~R120–R250/m².
- Liquid rubber / polyurethane. Seamless, great around tricky details and gutters. Mid-to-high cost.
Surface prep is everything
Most waterproofing failures come from poor preparation, not the product. A good contractor cleans, repairs cracks, primes the surface and applies the correct number of coats or layers. Skipping prep is why cheap jobs peel within a year.
How long it lasts — and the guarantee
Quality torch-on lasts 10–15 years; membrane systems 5–10, depending on sun and foot traffic. Re-coating before the system fully fails is far cheaper than repairing water-damaged ceilings. Insist on a written workmanship guarantee.
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