Flat Roof Waterproofing is a complete system laid over a flat roof to keep water out, such as torch-on membrane, liquid membrane, bitumen coatings or polyurethane. It suits new flat roofs and older ones where patching no longer holds. Send one request and local contractors will contact you with prices.
Describe the job once and get flat roof waterproofing quotes from local contractors.
Get Roofing QuotesWhen to Waterproof a Flat Roof
- New flat roof or extension. Waterproof before the first rains.
- Repeated leaks. Patches keep failing and new leaks keep appearing.
- Worn or brittle surface. Cracking, crazing or bare patches across the roof.
- Change of use. A roof becoming a deck or walkway needs a tougher system.
Materials and Methods
- Torch-on membrane. Heat-bonded bitumen sheets. Tough and widely used on concrete roofs.
- Liquid membrane. Brushed or rolled on with a reinforcing fabric. Seamless and good around awkward details.
- Acrylic or bitumen coatings. Lower cost and quick to apply, but need recoating sooner.
- Cementitious. Cement-based coating that bonds well to concrete.
- Polyurethane. Flexible, durable liquid system for roofs with movement or foot traffic.
What the Work Includes
- Preparation. Cleaning, removing failed layers and repairing cracks.
- Falls. Screed added where water ponds so it drains to the outlets.
- Detailing. Outlets, pipes, parapets and upstands sealed before the main area.
- Finish. Reflective or protective top coat where the system needs it.
Flat Roof Waterproofing Prices
Ballpark prices so you can sanity-check a quotation.
| Item | Ballpark price |
|---|---|
| Acrylic or bitumen coating | R100 - R180 per m² |
| Cementitious waterproofing | About R140 per m² |
| Liquid membrane | R150 - R350 per m² |
| Torch-on membrane | R250 - R500 per m² |
| Polyurethane system | R350 - R500 per m² |
| Screed to fix ponding | R60 - R100 per m² |
| Parapet wall waterproofing | R3,000 - R8,000 |
Prices JUST UPDATED. Indicative ballpark figures in rand, rounded, based on typical South African market rates. They are not our prices or quotations, and no contractor is bound by them. Ask whether VAT is included, and check what each quotation covers, such as scaffolding, rubble removal and call-out fees.
For a fuller breakdown, see the Roof Waterproofing Cost guide.
Get prices for your roof rather than a range. Send one request, with no obligation.
Get Roofing QuotesWhat Affects the Price
- System chosen. Coatings cost least. Torch-on and polyurethane cost more but last longer.
- Roof area. Priced per m², so size matters most.
- Preparation. Stripping old layers, priming at R30 - R60 per m² and screed add cost.
- Parapets and details. Upstands, outlets and pipes add labour.
- Access. Multi-storey buildings may need scaffolding at R5,000 - R15,000.
How Getting Quotes Works
- Request. Tell us the work, your area and how to reach you. Photos help.
- Match. Your request goes to local roofing contractors suited to the job, with your permission.
- Quote. Contractors contact you, inspect if needed and give a written price.
- Compare. Check scope, materials, warranty and payment terms side by side, then hire one or nobody.
Flat Roof Waterproofing FAQs
Which flat roof waterproofing system is right for me?
It depends on the surface, foot traffic and budget. Torch-on and polyurethane suit long-term protection, while coatings suit tighter budgets.
Do I need to strip the old waterproofing?
If it is loose, blistered or brittle, yes. A well-bonded layer can sometimes be overcoated after checks.
Why does ponding matter?
Standing water wears down any system faster. Fixing the falls with screed protects the new layer.
What is the difference between repairs and waterproofing?
Repairs fix specific damaged spots. Waterproofing replaces or adds a full protective layer across the roof.
Related Services
Use one form on Roof Repairs South Africa to get waterproofing prices from local contractors and choose the system that fits.
Roof Repairs South Africa is a lead-generation and quote-comparison service. We do not carry out roofing work and we do not employ roofers. Work is quoted and carried out by independent contractors, and your agreement is with the one you choose. Get a written quotation, check insurance and workmanship warranties, and avoid paying the full amount upfront.
Flat Roof Waterproofing. Describe what you need once and get the best quote, fast.
Get Roofing QuotesGet the Best Quote, Fast
Keep it brief. Say what needs doing, where the property is and how to reach you. Your enquiry is passed only to roofing contractors suited to the job, and you decide whether to go ahead.
Client Reviews
Powered by leaderr
