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  • Slabs & foundations
  • 25–35 MPa

Suspended Slabs and Reinforced Concrete Floors: Free Quotes

Planning a reinforced concrete suspended slab or first floor? Send one request and independent South African contractors will quote free. No fee, no obligation.

  • Quotes fromsuspended slab contractors
  • Areaall nine provinces
  • Cost to youfree

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Workers fixing reinforcing bars on top of shuttering and steel props for a first floor suspended slab on a house under construction
Workers fixing reinforcing bars on top of shuttering and steel props for a first floor suspended slab on a house under construction

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Tell us what you need and where. A contractor or supplier who works in your area quotes you directly. Free, no obligation.

Pour docketPD 708662

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Length and width in metres, thickness in millimetres. Add a row for each slab, footing or path. The totals go into your request.

#Length mWidth mThick mmQty
1×××
2×××
3×××
0m² area
0m³ concrete
06 m³ trucks

Order about 5–10% more than the net volume to allow for waste and uneven ground.

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A suspended slab is a reinforced concrete floor that spans between walls or beams with nothing but air beneath it. It is how most double storey houses get a first floor, and how flats, balconies and garage roofs are built. ConcreteSlab.co.za is a free quote service. You fill in one form and we pass your request to independent concrete contractors and ready-mix suppliers in your area, who quote you directly. We do not pour, sell or deliver concrete ourselves. There is no fee and no obligation.

What a suspended slab is

A suspended slab carries its own weight, the floor finishes, furniture and people across an open span. It does this with steel reinforcement in the bottom of the slab, where the concrete is in tension, and concrete in the top where it is in compression. Typical thickness is 150 to 250 mm, depending on the span and the load.

Searches for a reinforced concrete slab or a concrete slab for a double storey house usually mean this type of floor. The slab is poured on formwork held up by steel props, which stay in place until the concrete has gained enough strength.

Design, standards and engineers

A suspended slab must be designed by a registered structural engineer. This is not a job to copy from a neighbour. The engineer works to SANS 10100-1 for structural use of concrete and sets the thickness, the bars and the concrete strength, which is often 25 to 35 MPa.

  • Reinforcement: bars to SANS 920, sometimes with mesh to SANS 1024, cut and bent to the engineer's schedule.
  • Concrete: ready-mixed to SANS 878, with the strength written on the order.
  • Approval: local authority and NHBRC requirements apply to new homes, so keep the engineer's drawings.

Site realities in South Africa

Suspended slabs need a concrete pump or a hoist, because wheelbarrows cannot reach a first floor. Check that a pump truck can park close to the house and that overhead power lines are clear.

Near the coast, chlorides corrode steel, so the cover to the bars and the concrete mix matter more. On the Highveld, plan for cold mornings and cure the slab properly in dry, windy weather. Props are usually hired, and they must stay until the engineer says they can come out. In many towns, delivery distance and minimum loads also shape the quote.

What affects your quote

We never give prices here. People search for the cost of a slab, but every floor is different. Contractors and suppliers will look at:

  • The floor area and slab thickness, in m².
  • The concrete volume in m³ and the strength class.
  • The reinforcement, and whether it is supplied cut and bent.
  • Formwork, props and the time they stay on site.
  • Pump hire, truck access and part-load charges.
  • Whether you want labour only or the full job.

Attach the engineer's drawings if you have them. Quotes are far easier to compare that way.

Comparing quotes for suspended slabs

The lowest figure is not always the best deal. When your quotes arrive, check:

  • Specification: the thickness, the concrete strength in MPa, the steel and the membrane, so every quote is for the same work.
  • Preparation: excavation, sub-base compaction, shuttering and who removes spoil and rubble.
  • Concrete and access: ready-mix or site-mixed, whether a pump is included and any part-load or waiting charges.
  • Finish, curing and guarantee: the surface finish, how long it will be cured, where joints are cut and what guarantee covers the work.

What to include in your request

  • Attach the engineer's drawings and bar schedule.
  • Give the slab area in m² and thickness in mm.
  • State the concrete strength in MPa.
  • Say whether formwork and props are included.
  • Describe truck and pump access to the site.

Frequently asked questions

Does ConcreteSlab.co.za pour suspended slabs?
No. ConcreteSlab.co.za is a free quote service. You send one request and we pass it to independent concrete contractors, ready-mix suppliers and builders' merchants near you. They quote you directly. We do not pour, sell, deliver or install anything, and there is no obligation.
Do I need an engineer for a suspended slab?
Yes. A suspended slab carries load across a span, so a registered structural engineer must design it. The engineer sets the thickness, reinforcement and concrete strength. Contractors will want the drawings before they quote, and the local authority and NHBRC may ask for them.
How long do the props stay under a suspended slab?
That depends on the span, the mix and the weather, so follow the engineer's instruction. Props usually stay for several weeks, not days. Taking them out early can crack or sag the slab. Cold Highveld mornings slow the gain in strength.
Can a suspended slab be poured without a pump?
At first floor height it is rarely practical. Concrete is usually pumped to the deck, or lifted by crane and hopper. Tell contractors about site access, the height of the slab and any power lines, so they can allow for pump hire and truck positioning.

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Suspended Slabs by city and town

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