Roof waterproofing Cape Town

Brown ceiling stains, damp patches that grow after rain, blistered or peeling paint on the ceiling, water pooling on a flat roof for more than a day and lifted or cracked membrane edges around parapets and outlets. Mould and a musty smell in a top-floor room are also common. Any of these means water is already getting through.

Often, yes. If the existing membrane is sound and only the laps, flashings or outlets have failed, patching and resealing those areas is enough. If the membrane is brittle, bubbling across large areas or has been patched many times, a full strip and reseal gives a far longer lasting result. A specialist should inspect the whole roof before quoting.

Late summer and early autumn, before the winter rains start. Cape Town's wet season brings weeks of rain at a time, so a roof with a known problem should be sealed while the weather is dry and the membrane can cure properly. Wind-driven rain from the north-wester also finds weak laps and flashings, so ask for those to be checked.

Most acrylic and liquid membranes need 24 to 48 hours of dry weather to cure, with each coat needing a few hours between applications. Torch-on membranes are sealed by heat and can take rain almost immediately once the laps are done. Plan the work for a clear weather window and ask the specialist to check the forecast.

In Cape Town, roof waterproofing is usually priced per square metre, roughly R150 to R350 depending on the system and how much preparation is needed. Small leak repairs around a parapet or outlet often cost R1,500 to R4,000, while a full flat roof reseal can run R15,000 to R45,000. Ask for preparation, membrane and coats to be priced separately.