A further expansion of the production capacity was necessary at the head office of Q-Cells AG in Thalheim near Wolfen. The rapidly growing company has become the second largest supplier of photovoltaic cells in the world, within the space of 5 years. During expansion of the site innovative building technology was omni present – so that building progress could be accelerated significantly through the use of modern precast building techniques. The sealing work, in the area of elements subjected to pressurised water, is a critical factor in the economics of precast construction.