Continued growth needs of industrial, residential, warehouses and offices makes the construction industry to seek new ways to reduce construction time, while avoiding the loss of quality. To date, there are many new technologies, among which are the universal solution are pre-fabricated buildings made of metal. Lightweight and comfortable, they have the strength and low price. This direction is quite promising in today's market, as more companies offer installation of prefabricated structures and their relevance and popularity among customers is constantly growing. Prefabricated buildings are of steel frame, surrounded by wall panels. To erect such a building takes just a few weeks, while it does not require high costs and the reliability is not inferior to brick or concrete. Prefabricated houses do not require special construction materials and installation of deep foundation. This is due to the fact that the metal forming the basis of the building, have high strength and resistance, and their installation requires no welding, which significantly accelerates the assembly and increases their quality. Such structures are easily assembled and dismantled, in addition, they do not require special transportation. Pre-fabricated structures can be used for the construction of industrial facilities, office or administrative buildings, supermarkets, shops, customs terminals, service stations, sports and entertainment complexes, etc. Among the materials for the construction of prefabricated buildings are the most popular sandwich panels. In modern building under the sandwich panels is understood laminate consisting of two tiles, profiled stained sheets and insulation layer. The outer skin can be made of galvanized sheets in different colors, and insulation - polystyrene foam, mineral wool or polyurethane foam. Expanded polystyrene - a building material with unique thermal insulation properties. It almost does not hold heat, keeping it indoors in winter and not allowing it to penetrate into the building during the summer. In addition, he is absolutely not affected by moisture and mechanical damage. Sandwich panels made of mineral wool have substantially the same insulating properties as the panel with polystyrene foam as a filler. Prefabricated buildings, which are used in the construction of sandwich panels, characterized by high heat and sound insulation, fire resistance and moisture resistance, attractive appearance and durability. They are relatively easy and inexpensive to produce, they have a simple design, ease of assembly and disassembly and easily, thereby reducing the load on the foundation and transportation costs to the construction site. Compared with a brick, concrete and reinforced concrete panels, sandwich panels can generally reduce the size of investments in construction and reconstruction due to a significant reduction of material and labor costs. High speed construction of buildings from sandwich panels makes them indispensable in cases requiring a rapid return on investment. Sandwich-panel distinguish good energy-saving features, speed and ease of installation, as well as compliance with all sanitary and fire regulations. Sandwich panels provide reduced operating and overhead costs at the unit base. Sandwich panels do not require external and often interior, as covered by special anti-corrosion and hygienic layer, which has a good protective heat-insulating properties, and also serves as the decorating surface. Another advantage of the sandwich panels is that the erection of buildings of this material may, at any time of year, because it does not require time-consuming "wet" work. Among the major shortcomings of the sandwich panels note the need for careful handling during installation and operation, as rough handling can damage not only a protective coating, but the very outer panel (in this case, a facelift or a complete replacement of the panel). In addition, the panel may not freeze at the joints or form ice on the surface during the winter. However, these problems can occur only when non-compliance with installation technology panels, so installing the buildings from sandwich panels must be carried out by experienced professionals. For the application of sandwich panels virtually no limits: they can be used for both industrial as well as for manufacturing, warehouse, office, retail, sports and even residential buildings. Sandwich panels are often used for insulation of existing buildings, as well as insulation of refrigeration and freezers. Currently, construction of sandwich panels is mainly in the commercial sector. Sandwich panels are gaining increasing popularity in many countries, including in Russia. In the Russian market there is a wide selection of panels, which, depending on the application, divided into three types: wall, roof and finishing: Wall panels are used for the construction of industrial buildings and commercial purposes. As the coating materials (for internal lining) in addition to steel sheets can also be used plasterboard or cement-slab. Such material is used for the construction of interior partitions. Often the panels are placed inside the special cable channels for wiring. Roof sandwich panels used for roof of industrial and commercial buildings. Sometimes, for such panels, an additional bitumen substrate, thereby reducing the water permeability and thermal conductivity. Finishing the sandwich panels used for insulation and renovation of the walls.
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