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LEEMICK  Screeded System

The LEEMICK 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 are available. A flow and return manifold is fitted in a central location. The underfloor heating 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 LEEMICK  layout drawings supplied. Pipes are held in place with U-clips which are fixed using the Tacker. Finally, the pipe work 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 pipe work is filled with water and pressure tested to 3 bar gauge. 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 75mm thick. Reinforcing mesh can be used where this is required and expansion profiles are available which allow the heating pipe work to pass through an expansion joint.

If insulation is supplied by others the fixing system changes to a Cliprail system.

LEEMICK Structural Floor System


Laid in a similar manner to the screeded system, the underfloor heating pipework is tied to a reinforcing steel mesh by means of cable ties. The floor slab is then laid over the underfloor pipe work.


LEEMICK Suspended Floor System

For suspended timber floors, aluminium diffusion plates are fitted between the joists and are nailed / stapled in place. With joist centres of 400mm , a plate 388mm wide is used, having two channels along its length on 200mm centres. Other plate sizes and arrangements are available. The plates are fitted with a 300mm gap from a facing wall and with a l00mm gap between plates.

Underfloor  pipe is run in the plates in a snake pattern, with the pipe turning between the joists at one end and through the joist at the other. To provide joists on 400mm centres and to avoid notching of the structural joists, cross battening of the floor can be used. Battens of 25mm x 25mm are adequate to support the plates and finished floor. These should be laid in the opposite direction to the existing joists.

Once all the pipe work is installed, the flooring can be fitted.

LEEMICK Floating Panel System

Pre-grooved polystyrene insulation panels are laid onto an existing flat surface, normally with DPC membrane below.


Aluminium diffusion plates are then pressed into the pre-grooved polystyrene panels, allowing the Underfloor heating pipe to be laid into the plate.

Pre-grooved polystyrene panels are supplied in two thicknesses 4Omm HDN and 5Omm SDVB.


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