The diagram below shows an example of PEX Floor Heating Pipe layout for a ground floor including suggested loop-lengths and manifold positioning.
Advice on Insulation and Floor Constructions
We recommend a minimum of 50mm of Polyurethane insulation for the underfloor heating system. This is very high quality insulation and can be used for both concrete and timber suspended floor constructions. All insulation requirements should comply with current building regulations.
We do not supply insulation. Any builder’s merchant will stock insulation such as Xtratherm or Kingspan. The quote is based on clipping the pipe direct to the insulation board. We supply the pipe clips. Use a minimum of 65mm of screed on top of the insulation for concrete floors. Plastic sheets must not be laid on top of the pipes.
Also 50 mm liquid screed or fibre screed can be used for screeded floors. It is important to use a plastic membrane on top of the insulation for liquid screed. Edging strip must also be used all around the perimeter of the walls.
The diagram below shows an example of a pipe layout for a ground floor including suggested loop-lengths and manifold positioning.
Moisture Content in Screed and Floorboards
The screed must be allowed to dry for a minimum of 4 to 6 weeks before the heating is operated. As the system is used for the first time, the mixing valve must be set to minimum setting to let the moisture in the screed dry out. The temperature should be increased by two degrees every day until the mixing valve is set at 45°C.
Care must be taken to protect the pipework whilst installing the screed. Finally the floor finish is laid. Underfloor heating works well with almost any floor finish; tiles, carpets (use carpets with a resistance of less than 0.15 m2K/W), timber floors, plastic etc. The floor coverings and the adhesive must be suitable for the temperatures that underfloor heating will provide; the maximum temperature they need to resist being 40°C. Carpet and underlay together must not exceed a thermal resistance of 2.5 Tog.
Floorboards must have a moisture content lower than 7% before they are installed. We do not recommend floorboards thicker than 25mm. Always check with the manufacturers of any floor finish that it is suitable for underfloor heating.
Please Note:
Always check with the manufacturer of the floor covering if it can be used for underfloor heating. Timber floors need to have a moisture content below 10% to avoid shrinkage. The system must be operated for 21 days with a very low temperature to dry the screed, then the floor covering can be laid. Also note that the screed must be allowed to dry for 6 weeks before the underfloor heating is operated.
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