A layer of insulation is laid directly on the sub-floor, which must meet current  Building Regulations as well as the requirements for your building to reduce heatloss.

A Slip membrane is then added over the insulation to prevent the screed layer bonding to the insulation, allowing independant movement of the different layers. Slip Membrane  layers do not act as a Damp Proof Membrane or Vapour barrier and these, if required must be incorporated elsewhere in the floor structure.

An underfloor heating system in screeded floor relies on the thermal mass of the screed to transfer the heat to the rooms. It is recommended to use programmable room thermostats for extra comfort.