The Old Forge in Ottersburg/Altmark is a monument-listed building of historical value (160m²; 4m high walls) which has been completely renovated.
Its field stone walls required an efficient and adequate inside insulation applying 4cm permeable plaster onto which the 5cm thick calcium-silicate panels have been fixed. The main hall having a clear hight of 6m up to the ridge required satisfactory heating capacity both from the walls as well as from the floor. For cooling purposes during the summer period, the capillary tube mats fixed to the walls suffice. The Old Forge serves inter alia as a demonstration object for the Hippokrates-System and may be visited for information purposes as well as rented out for celebration and other events.