Roofing screws

In many ways, how high -quality the installation of the roof is depending on its service life. Roofing self -tapping screws play a large role in performing installation work. To ensure the tightness of the mounting site in roofing screws, there must be rubber washers. A special requirement for the quality of self -tapping screws, since there is a huge number of low -quality materials, which leads to poor work results. In poor quality self -tapping, the rubber gasket can be easily separated from the washer. High -quality screws are marked. If you decide to purchase not marked roofing screws, the quality of which is in doubt, then most likely a rubber washer on such a screw will be destroyed two years after the acquisition, or even earlier. Moisture will fall under the hat of such a self -tapping screw and rusty smudges will appear on your roof.  Roofs of the highest quality are considered products, in the production of which exclusively high -quality carbon steel with an anti -corrosion coating or stainless steel is used. By the way, a car navigator is very popular now, many motorists use it. Such screws are twice as expensive. To check the quality of the screw, you need to squeeze the puck with pliers. If high -quality self -tapping screw, then rubber gasket and painted surface will remain intact after compression. If a low -quality self -tapping screw, then the rubber washer is damaged, and the paint will exfoliate. Self -tapping screws that are made in Europe are subjected to strict quality control, they are experienced on extreme and prolonged loads.  If the screw withstands 20 thousand vibrations for 5 degrees, 2 thousand by 10, 100 by 15 degrees, then this means high quality of the product. At the same time there should not be irreversible changes. The service life of high -quality screws provides 50 years of life of any metal structure.