The latter option is preferable, because by combining design of bearing and protecting the functions provided by lower costs of labor and material consumption. Cover long flooring design, using standard precast concrete products, under the unified directory of industrial products for the building. In accordance with the space-planning decisions of the building used lengthy flooring surfaces with a flat or gable top surface. Typical floors have openings 9, 12, 15, 18 and 24 m and made in the form of thin-walled reinforced concrete ribbed slabs (with contour and transverse ribs) thin-walled curved plates of type and plates type 2T (c flexinvest type IT). Along with these products use advanced high prefabrication – integrated padded flooring types 2T and special insulated flooring coverings in public buildings, preformed from the constructive keramsit.
Light concrete decks have longitudinal ribs and a three-layer slab with thermal insulation. Last used for overlapping spans of 18 m, and insulated flooring type 2T – up to 24 m. After the installation of insulated flooring coatings on a construction site operates only waterproofing work. In some cases, to cover public buildings used box- reinforced concrete decking or flooring-ducts. In-plane coverages with rod bearing elements (beams, trusses, etc.), the last set in increments of 6 or 12 m (sometimes 15 or 18 meters), based on the columns, at least on the supporting wall. Flooring coatings based on the beams (trusses) and connected by welding steel inserts elements of these structures. The best economic results of using the coating decks of light or aerated concrete than ensured not only by carrying capacity, and thermal insulation coatings.