effidur – the professional floor refurbishment system with additional floor heating and coolingEffidur - a young innovative brand in underfloor heating – has successfully established itself since 2007 in the growing market of renovation and refurbishment with the development of an extremely flat floor reinforcement system that can additionally be equipped with heating pipe. The effidur floor systems might be used for sole floor reinforcement and additionally as highly efficient underfloor heating and cooling. The idea behind it: two firmly connected, pre-shaped steel sheets form a honey-comb shaped system panel. These panels are installed on the sub-floor and connected to each other by a simple click-system. They are available in three heights – 9, 10 and 20 mm. A heating pipe can optionally be inserted between the honey combs. Finally the panels are filled with screed, with an overlap of only 5 mm. Even minor damaged deal boards or old tiles are sufficient as sub-floor. In figures this means a construction height of only 15 mm including screed instead of 65 mm as for a conventional underfloor heating. Also the effidur system only weights a fourth of what ordinary underfloor heatings weight. Furthermore, the combination of steel sheets and screed enable the use of the effidur floor systems for traffic loads of up to 500 kg / m². The heat conductivity of the steel sheets which are in direct contact with the heating pipe is excellent, the screed overlap is extremely thin – both together is a double benefit: this way the effidur floor systems are as comfortably controllable as a local radiator instead of being as slow as conventional underfloor heating. Already after a few minutes the heat is spread evenly. The low flow temperatures of the system are ideal for heat pumps and the use of renewable energies. Besides the retrofit of residential buildings the effidur floor systems have also been applied for public buildings under preservation order as well as for churches, pre-schools, museums or similar.