Diagram of a concrete screed floor construction showing position of underfloor heating pipe.

This technique is preferred by many builders. A concrete sub-base is poured and the
construction of the house may then continue right up to second fix before the pipes
need to be installed. 35mm minimum high density extruded polystyrene insulation is used. The pipes are attached to the insulation and a 60mm concrete screed is poured around the pipes to give 40mm cover over the pipes. This gives good thermal conductivity with a faster response time than a full concrete slab.

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Close-up Photo

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