Facade and roof structures bear significant loads throughout their entire service life. The operation of roofing material directly depends on the quality of installation and selected components. Therefore, for the installation of the roof, roofing screws for metal are used, which are resistant to external aggressive environments. To avoid the appearance of rust, it is necessary to use only high-quality samples to strengthen the roof. Screws produced using modern technology are suitable for use for fifty years.
Roofing self-tapping screw is a hardware product that is designed for mounting the corresponding components and metal tiles. In appearance, this is a metal rod with a screw thread. One end of the rod ends with a hex head, the other with a drill (it can drill through the material to be fixed and the base). The sharpening quality of the tip and steel material excludeviolation of the metal surface around the drilled hole. Such self-tapping screws are made both with a conventional drill and with a reinforced one.
To ensure the waterproofing of the connection, the roofing screw is completed with a galvanized washer with a rubber gasket, which is made of modified artificial rubber. It is firmly pressed into the base of the aluminum washer. When screwing the screw in the warp zones and in the process of re-tightening, the gasket exhibits plasticity properties. It is a sealant. The rubber gasket is resistant to precipitation, UV, temperature extremes, ozone.
The optimal thickness of the metal that a roofing screw drills is 2.5 mm. 6 - 8 products are used per square meter. As a rule, they are attached to the lower part of the corrugated board wave at the junction with the crate a couple of centimeters below the protruding step. After fixing the self-tapping screw into the crate, the rubber gasket of the washer deforms and hermetically fills the space between the screw head and the roofing metal. Soon the backing of the washer vulcanizes and creates an impermeable joint.
Roofing metal screws are made from high carbon steel. Zinc coating on self-tapping screws is applied electrolytically. In this case, the zinc layer is approximately 20 µm. Depending on the surface of the corrugated board to be attached, painted or galvanized self-tapping screws are used. Modern roofing materials have a variety ofcolor range, so the roofing screw 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 over with polymer paint. For durability of a covering powder paint is processed by the furnace way.
A variety of roofing screws are self-tapping screws for building materials with a three-layer structure (sandwich panels). Having a great length, they are able to break through the buffer layers with insulation under the roofing sheet and reach the base. Facade structures allow the use of roofing screws without a sealing rubber washer.
