Graphical Construction Glossary >> Temporary Work. >> formwork >> Permanent Formwork

Permanent Formwork
Formwork that is left in place after the concrete is set. Examples are metal pan systems like "Bondek" that simply the forming of suspended slabs and because of their thickness and keying into the concrete also contribute to the strength of the slab, reducing rebar costs.

roll formed sheet metal formwork

column formwork

Formwork that remains a permanent feature of the building can be cheaper and or have a higher standard of finish than conventional formwork.

The suspended slab in the photo above has been formed by using a proprietary product made our of heavy gauged galvanised steel sheeting roll formed with dovetail like keys that bond it fully into the concrete slab. Using a product like this is very convenient and cost effective.

  • In the case above the sheets would be cut to size and dropped inside the already constructed MS angle perimeter beam.
  • A single timber bearer and row of steel props are all the extra support required.
  • The thickness of the steel formwork varies, but in all cases it adds to the strength of the finished job. When this happens it is known as Participating Formwork. Reductions can be made the the thickness (cost) of the reinforcing mesh used in the slab.

The column at the right has been formed using machine rolled air conditioning ducting. These can be made to different diameters.

Other examples like this are circular column forms made out of concrete pipes, or PVC pipes.

For non glossary articles of a general and how to nature go to the formwork section on this site.

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"What can be added to the happiness of a man who is in health, out of debt, and has a clear conscience?
Adam Smith 1723-1790

"When we build, let us think that we build for ever."John Ruskin 1819-1900

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Please Note! The information on this site is offered as a guide only!  When we are talking about areas where building regulations or safety regulations could exist,the information here could be wrong for your area.  It could be out of date!  Regulations breed faster than rabbits!
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