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The floor should be sanded before installation. The floor should be even - maximum 2 mm over a length of 2 meters. Three-layer boards for underfloor heating are usually 12-14 mm thick. This thickness allows for easy flushing of wooden floors and ceramic tile floors. Interesting information: a 9 mm thick floor retains up to 25% less heat than a 14 mm floor. This and other interesting practical information is presented by Radosław Szczepański from Demo-Projekt.