Underfloor Heating Information
Note we do not supply the insulation. Any builder’s merchant will have Celotex or Kingspan insulation
in stock. The quote is based on clipping the pipe direct to the insulation board. We do supply pipe
clips. We recommend 65 mm of screed on top of the insulation for concrete floors, for timber
suspended floors see this document.
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 to dry out. The temperature should be increased by two degrees every day
until the mixing valve is set at 45°C. Floorboards must have moisture content lower than 7 % before
they are installed. We do not recommend floorboards thicker than 25 mm, see website link under
technical for more information about floorboards. Always check with the manufacturers of any floor
finish that it will work with underfloor heating.
For stone and ceramics tiles it is recommended that flexible adhesives and grout are used. Avoid
underlays for carpet with felt and rubber crumb type. With Vinyl check the vinyl floor manufacturer
that it works with underfloor heating. Laminate flooring should have an expansion gap for movement.
