by MacAlpine


Interspan -Tournai Belgium

The Interspan post-tensioning system is a sustainable solution.

It offers substantial savings over conventional reinforced concrete by reducing material, installation costs, and construction time.
In addition, the post-tensioning system is able to provide longer and stronger spans and reduced slab thicknesses, which increases the useable floor space of buildings, making this system an economical choice for our clients.

Interspan BVBA is based in Aaarschott, Belgium


Longer Spans

Post-tensioning allows longer spans to be used. This means the number of columns per floor is reduced, which opens up the floor area and increase the flexibility of the structure.

Overall Structural Cost

Post-tensioning becomes more economical than plain reinforced concrete slabs for spans greater than 7 metres. This is due to the reduced cost of materials, labour and formwork.

Reduced Floor to floor-to-floor height

The slab thicknesses can be reduced when using post-tensioning. This results in savings for facade costs and allows more floors to be constructed within the original building envelope.

Deflection Free Slabs

Slab deflections can be eliminated with post-tensioning.

Rapid Construction

Post-tensioning allows for earlier removal of formwork and reduced back-propping requirements. This means faster construction cycles with the quick reuse of formwork.

Column and Footing Design

Reducing the slab thickness has the benefit of reducing the floor dead loads, which results in an economical design of the concrete columns and footings.

Waterproof Slabs

Post-tensioned slabs can be designed to be 100% crack-free, which means the slabs are essentially waterproof. In order to construct a waterproof slab, the choice of concrete mix, curing methods, quality workmanship and detailing are key factors.