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Balconies

 Published Date: 29/05/2009
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reinforcement to be stainless, although some systems use ‘normal’ reinforcement in a sleeve.  To take compressive forces, a compression element is incorporated near the bottom of the element.  These may be a low conductivity concrete block (as in Isopro) or a stainless steel pressure pad (as in Halfen).

Isopro ‘exploded’

Isopro in place


Most systems have a nominal 30 minutes fire resistance, which can be increased to 90minutes by adding fire resistant board above and below.

When used with precast balconies, the assembly is cast into the balcony at the precast works.  The assembly is supplied in lengths typically 1m long, with make-up pieces as required.

The balcony is then placed on staging at site, and the insitu slab cast against the projecting reinforcement.  It is important to allow for initial settlement/deflection by setting the staging slightly higher than horizontal.  Suppliers’ designs will give the figure to allow for this.

  


  ©2012 Cliff Billington on behalf of J&P Building Systems Ltd

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