Concrete Roof Slabs are flat roofs built as suspended concrete slabs, screeded to falls and waterproofed. They suit modern homes, roof decks and buildings designed for later extension. Send one request and independent contractors reply with prices.
Describe your project once to get concrete roof slabs quotes.
Request a QuoteWhat the Work Includes
- Structure. Rib and block or in-situ roof slab.
- Screed. Screed to falls towards outlets.
- Waterproofing. Torch-on, liquid or other membranes.
- Outlets. Rainwater outlets and overflows.
- Parapets and upstands. Detailing at edges.
- Insulation. Where needed for energy rules.
Suitable Projects
Modern flat-roof homes, roof terraces, garages, outbuildings, commercial buildings and future-proofed roofs for a later storey.
Available Systems
- Rib and block roof. Economical for standard spans.
- In-situ roof slab. For cantilevers, overhangs and long spans.
- Inverted roof. Insulation above the waterproofing.
How the System Is Chosen
The engineer sizes the slab for roof loads, decks or future floors. The waterproofing system is chosen for use, exposure and maintenance.
Project Process
- Design. Structure, falls and drainage.
- Build slab. Props, steel and concrete.
- Cure. Slab cures before screeding.
- Screed. Falls to outlets.
- Waterproof. Membrane, flashings and outlets.
- Test. Flood or water test where specified.
Concrete Roof Slabs Prices
Ballpark prices so you can sanity-check a quotation.
| Item | Ballpark price |
|---|---|
| In-situ concrete roof slab | R1,500 - R2,800 per m² |
| Rib and block roof slab | R950 - R1,500 per m² |
| Screed to falls | R150 - R350 per m² |
| Torch-on waterproofing | R250 - R650 per m² |
Prices JUST UPDATED. Indicative ballpark figures in rand, rounded and excluding VAT. They reflect typical South African market rates for this kind of work. They are not our prices or quotations, and no contractor is bound by them. Confirm VAT, delivery, steel, concrete and what each quotation includes.
Get prices for your project rather than a range. Send one request, with no obligation.
Request a QuoteWhat Affects Cost and Timelines
- System. In-situ costs more than rib and block.
- Waterproofing. Membrane type and guarantee.
- Roof deck use. Heavier loads need a stronger slab.
- Insulation. Energy rules may need roof insulation.
What to Send for an Accurate Quote
- Your name, email and phone or WhatsApp number.
- Your town or suburb.
- The service you need.
- The approximate size, such as floor area in m² or wall length and height.
- A short project description and your preferred start date.
- Whether you have approved plans, engineer's drawings or a soil report.
Plans, drawings and photos can be shared with the contractor you choose once you are in contact.
Concrete Roof Slabs FAQs
Does a concrete roof leak?
The concrete is not the waterproofing. A well-detailed membrane, falls and outlets keep it dry.
Is a concrete roof cheaper than a pitched roof?
Usually not. It costs more but gives a usable roof and space for a future floor.
How long does roof waterproofing last?
It depends on the system and maintenance. Ask contractors for the guarantee period in writing.
Can I add a floor on a concrete roof later?
Only if the engineer designed it for that.
Related Services
Raft Foundations South Africa passes your request to independent roof slab and waterproofing contractors. Foundation and slab designs are project-specific, so confirm the design with a registered engineer and get a written quotation before you pay a deposit.
Concrete Roof Slabs. Describe your project once and get the best quote, fast.
Request a QuoteGet the Best Quote, Fast
Keep it brief. Give your location, the service, the approximate project size and a short description. With your consent, your enquiry is passed only to independent contractors suited to the job, and you decide whether to go ahead.
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