The Flat Slab system consists of a series of 1200 wide prestressed concrete slabs with a reinforced concrete topping. Depending on the clear span and loading, starting from 75mm thick. This composite construction allows clear spans of up to 8.0 metres. Most contractors agree that Flat slabs are a simple form of construction.

  • Category
    Floor Slabs
  • Country of origin
    New Zealand
  • Type of use
    Commercial and Residential
  • Installation
    Professional installation required


Flat Slabs are easily adapted to any floor plan and individual slab widths can be custom made to suit individual requirements. Service holes can be allowed for in the slabs. Cantilevered floors, balconies and decks can easily be created by using Flat Slabs to form the soffit to the slab.

Surface Finish:

The slabs are cast on a steel mould and the soffit is flat. This means that Flat Slabs may be left untreated, painted or decoratively sprayed to match colour schemes.

Sound Transmission:

A major practical benefit of a concrete floor is its ability to reduce noise transmission. Flat Slab floors are quiet and do not creak with temperature and moisture changes.

Transport & Installation:

Flat Slabs must be handled and stacked at two points, by, or directly beside, the lifting eyes. It is recommended that Flat Slabs be seated 75mm onto the supporting walls/beams.

Fire Resistance Rating:

Standard Flat Slabs can provide up to 1.5 hour fire resistance rating, but can be increased if the thickness of the slab and cover to steel is increased.


  • Flat Slab strength = 45 MPa at 28 days
  • Topping strength = 20 MPa at 28 days

For further advice on flooring systems or technical information please contact Ultimate Engineered Concrete, our experienced and qualified staff will be happy to discuss your flooring design.

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Ultimate Engineered Concrete is a quality supplier of precast and prestressed concrete. Our facilities are located in New Plymouth and our site allows us to cater for any project large or small within the North Island.

We offer a professional service to the highest possible quality and our Staff combines specialist industry knowledge and years of experience covering:

  • Commercial / Industrial projects
  • Residential builds
  • Civil & Infrastructure projects
  • Landscaping
  • Rural Products

We pride ourselves on the ability to assess each project individually and achieve the best possible solutions and products for our customers.

Our processes from design to Installation include multiple checks and measures to ensure an accurate product is delivered in full, on time, in spec, every time.