Facade and roofing structures aresignificant loads during the entire service life. Operation of roofing material directly depends on the quality of installation and selected components. Therefore, for mounting the roof used self-tapping roofing for metal, which are resistant to external aggressive environment. To avoid the appearance of rust, it is necessary to use only high-quality samples to strengthen the roof. Screws produced by modern technology are suitable for operation for fifty years.
Self-tapping roofing is a hardware product thatis intended for the installation of appropriate components and metal. In appearance it is a metal rod with a screw thread. One end of the rod ends with a hexagon head, the other with a drill (it can drill the anchor material and the base). The quality of the sharpening of the tip and steel material excludes the breaking of the metal surface around the drilled hole. Such self-tapping screws are manufactured with both conventional drill and reinforced drill.
To provide waterproofing connection of the self-tapping screwThe roofing is completed with a galvanized washer with a rubber gasket, which is made of modified artificial rubber. It firmly presses into the base of the aluminum washer. When screwing the screw in areas of skew and during re-tightening, the gasket exhibits ductility properties. It is a sealing seal. Rubber gasket is resistant to precipitation, ultraviolet, temperature changes, ozone.
Optimum thickness of metal, whichdrills a self-tapping roofing, is 2.5 mm. Six to eight products are used per square meter. As a rule, they are fixed in the lower part of the wave of corrugated board at the point of abutment to the crate for a couple of centimeters below the protruding step. After fixing the screw in the crate, the rubber washer was deformed and hermetically fills the space between the self-tapping screw and the metal of the roof. Soon the washer substrate vulcanizes and creates an impenetrable bond.
Roofing screws for metal are made fromhigh-carbon steel. The zinc coating on the screws is applied electrolytically. The zinc layer is approximately 20 μm. Depending on the surface of the corrugated board, use painted or zinc-plated self-tapping screws. Modern roofing materials have a variety of colors, so the self-tapping roofing assembly with an aluminum washer is painted in any color according to the RAL table. The head of the screw, the place under the cap and the steel coating of the washer are carefully painted with polymer paint. For the durability of the coating, the powder paint is subjected to a furnace treatment.
A variety of roofing screws areself-tapping screws for building materials with a three-layer structure (sandwich panels). Having a long length, they are able to break through the buffer layers with the insulation under the roofing sheet and reach the base. Facade structures allow the use of roofing screws without a sealing rubber washer.
