For solid floors, a liquid screed or concrete mix is the preferred application for underfloor heating. Applied over an insulation layer, the screed is an excellent conductor of heat and acts as a heat diffuser. The system plates system uses the special preformed plastic plates which hold the pipes in place and are designed to protect the pipes before the screed is laid. UnderfloorHeatingSystems Hep2OUnderfloorHeating&Cooling, Hep2OUnderfloorHeatingandCooling,