Screeded Floor System

The screeded system comprises of an edging strip which is laid against all of the external and internal walls, providing both edge insulation and an expansion zone for the screed.

Insulation is then laid onto the concrete slab. To ensure adequate insulating properties, a range of thicknesses of insulation are available. A flow and return manifold is fitted in a central location. The cross-linked polyethylene pipe is connected to the flow manifold by means of a mechanical connection and is then laid out in the required pattern as per the Heating layout drawings supplied. Pipes are held in place with U clips which are fixed using the Tacker. Finally, the pipework is connected to the return manifold.

Underfloor heating layouts are designed to have no joints in the pipe other than that at the manifold, minimising the risk of leakage. Prior to the screed being laid, the underfloor heating pipework is pressure tested to 3 bar. This pressure test is maintained during screeding to ensure that any damage resulting in a leak is immediately obvious. Following curing of the screed, the heating can be turned on and the flow temperature slowly elevated.

The screed used is standard with no special additives and, in most circumstances, should be 75 mm thick. Reinforcing mesh can be used where this is required and expansion profiles are available which allow the heating pipework to pass through an expansion joint.