In concrete screeded floors, the screed acts to diffuse the heat across the surface, providing an even temperature at floor level.
Depending on the type of building, construction or standards, there are a number of methods for laying underfloor heating pipes in concrete floor structures.
The most popular method of installation is as follows:
A concrete slab (or suspended beam and block construction) is laid over a damp proof membrane. A 20mm thick piece of insulation is fixed to the perimeter (external) walls, to a height to include the depth of floor insulation and screed.
Whilst the edging insulation may be on show, it is covered by wall plastering and skirting boards.
Floor insulation is laid over the whole area and joints are taped to prevent the ingress of screed between the insulation boards. The floor is now ready for the underfloor heating pipework installation.
We recommend you use a minimum layer of 50mm Polyurethane insulation. If there is not enough space for 50mm insulation, 30mm can be used. We recommend Polyurethane as it outperforms Polystyrene and its greater density allows use of clip fittings. All insulation requirements need to comply with the current building regulations. View our FAQs for more insulation information.
Finally 65 – 75 mm screed is laid on top of the insulation and piping.
If using polystyrene insulation (50mm) it is recommended that you install wire mesh on top of the insulation and tie the pipe to the mesh. For other floor constructions please contact our technical department.