Floor supports exposed concrete with internal insulation

Causes of thermal bridges

The connection between wall and floor, or floor support, leads to a thermal bridge problem (heat losses) when using exposed concrete in conjunction with internal i nsulation. This problem can be solved properly only in single-storey, self-contained buildings where there are no intermediate or other floors to interrupt the layer of insulation. There are two potential solutions for all other cases, but both must be considered in conjunction with the structural concept.

Outside temperature - 10°C

Outside temperature - 10°C

Fig. 36: Construction detail

Fig. 30: Isotherms diagram

Fig. 36: Construction detail

Solution 1: Strip of insulation in soffit

The inclusion of i nsulation around the perimeter of the floor, at its junction with the external wall, maintains the structurally compact connection between wall and f loor but does not solve the heat loss problem, the temperature drop at the surface of the concrete, entirely. Above all, it is the surface temperature at the base of the wall that remains critical. Furthermore, the layer of i nsulation disturbs the appearance of the soffit. If the soffit is plastered, it must be remembered that a crack could develop at the insulation-soffit interface.

Fig. 32: Isotherms diagram

Fig. 37: Construction detail

Fig. 33: Example of insulated reinforcement being installed

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