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Most waterproofing in South Africa is priced per m². A liquid membrane system runs about R180 to R350 per m² and torch-on about R250 to R450 per m², materials included. Stripping failed layers, fixing the screed or adding a reflective silver coat is extra, and small leak repairs usually carry a minimum call-out.

Torch-on is a bitumen membrane heat-welded onto the surface, tough and well suited to flat concrete roofs with foot traffic. Liquid systems are painted or sprayed on in layers with a reinforcing fabric, which makes them better for awkward shapes, parapets and details. A good specialist will recommend one based on the roof, not on habit.

A properly installed torch-on system lasts around 10 to 15 years, and a quality liquid membrane eight to 12, longer with a reflective top coat. Strong sun is the main enemy, so UV protection and an annual inspection make a real difference. Ask for the guarantee in writing before work starts.

Dry weather, because membranes need a dry surface to bond. In Gauteng that means autumn and winter, before the summer storms. In the Western Cape, late spring and summer, before the winter rain. Booking ahead of your rainy season also means shorter waits.