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Most waterproofing in Soweto 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.

Yes. Concrete slab roofs on extensions and backyard rooms crack and leak without a membrane, especially where they join the main house. Waterproofing during or just after the build is far cheaper than repairing damp walls and ceilings later.

On a flat roof in strong sun, usually yes. The reflective layer protects the membrane from UV, which is what makes bitumen go brittle, and it can noticeably cool the room below. It needs recoating every few years, so ask what the maintenance schedule looks like.

Not always. A sound old layer can sometimes be cleaned, primed and overlaid, which saves time and disposal costs. If it is blistered, lifting or trapping moisture, it must come off, or the new system will fail with it. Ask the specialist to explain which applies to your roof.