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Published Date: 29/05/2009 |
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Balconies are frequently precast and then attached to a structure during construction. If measures are not taken to prevent it, there is a route for heat loss between the internal structure and the external balcony. This heat loss can lower internal temperatures such that the dew point temperature is reached and condensation occurs
Traditionally the method used was to insulate the balcony (on both the top and bottom surfaces), and also to insulate areas of the slab within the structure. Current practice though is to incorporate a simple thermal break between the balcony and the supporting structure.
At the same time it is common to utilise a proprietary system to attach the balcony to the slab. There are several such systems available, two examples of which are below.
They all work in a similar fashion. There is an insulating layer, normally of polystyrene, typically 80mm wide. To take cantilever bending moments, there is tensile reinforcement in the top of the element, passing through the insulation. To prevent risk of corrosion, it is best practice for this tensile |
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