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Although ECOMAXX underfloor heating works without any insulation, purpose of the thermal insulation is preventing heat transfer below the heating element. Common sense says that we don’t want to lose heat to the ground, a garage or a neighbor downstairs. Lack of proper thermal insulation results in increased electricity consumption.
The usual type of thermal insulation that we use is Extruded Polystyrene (XPS), High density Expanded Polystyrene (EPS, Jablo) or Polyurethane (PU). All of those come in a form of boards which have to be glued to the flat and solid surface such as cement screed or old tiles.
Recommended thickness of thermal insulation is 3 cm, but if there isn’t enough space, it can be just one or two cm thick. The more the better Read more