Vetted waterproofing specialists in Johannesburg. Book now.

Budget around R180 to R350 per m² for a liquid membrane and R250 to R450 per m² for torch-on in Johannesburg, with materials included. The price climbs if old waterproofing has to be stripped or the screed needs falls built in. Ask for the labour, materials and guarantee period on the quote.

Johannesburg gets heavy afternoon thunderstorms through summer, with sudden downpours and hail that test every outlet and joint. Flat roofs need generous outlets and overflows so water never backs up. Getting waterproofing done in the dry winter months avoids storm delays.

It should. Reputable specialists in Johannesburg give a written guarantee, typically five to ten years for a full system and shorter for patch repairs. Read what voids it, such as foot traffic or other trades drilling through the membrane, and keep the invoice somewhere safe.

Look for blistering, cracking or lifting membrane, ponding water that never drains, and damp patches or peeling paint on ceilings and walls below. Moss or plants growing on a flat roof are another sign. Catching it early usually means a repair rather than a full redo.