Hall buildings are designed to create the largest indoor open areas with indefinite possibilities of maneuvering and storage. Hence, load bearing structure of factory halls and warehouse halls usually consists of prefabricated column systems, beams and girders. Also the external walls or fire separation walls are produced more often as the precast units. To speed up the construction time, sometimes spot footings and footing beams are prefabricated. Very often in halls with a large span and significant floor slab loads TT slabs are built in to reduce the number of intermediate columns in the built facility.