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The plastic clip or fixing mechanism is hinged from the top of the spacer and does not come into contact with the soffit of the concrete. The plastic clip or fastening mechanism is incorporated at a depth of merely 5 mm into the spacer, thereby preserving the material's integrity at the surface of the product.
Metal snap fasteners, spring clips, and other snap-type connectors are still in broad use today. With the development of new flexible yet springy materials, such as molded plastic, and new manufacturing processes, many new variations in these types of connectors have been invented, and are commonly called snap-fits.
Manufacturers claim plastic lumber is more environmentally-friendly and requires less maintenance than wood/plastic composites or rot-resistant wood. [2] Commercially available polyvinyl chloride fiberglass composite lumber sold for decking meets stringent fire code standards. [3] Plastic lumber can displace wood timber (as harvested by forestry).
Other methods of joining materials, some of which may create permanent joints, include: crimping, welding, soldering, brazing, taping, gluing, cement, or the use of other adhesives. Force may also be used, such as with magnets, vacuum (like suction cups), or even friction (like sticky pads).
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Another advantage of copper roofing systems is that they are relatively easy to repair. Standing-seam metal roof with concealed fasteners. Mechanically seamed metal with concealed fasteners contains sealant in seams for use on very low sloped roofs, suitable for roofs of low pitch such as 0.5/12 to 3/12 pitch.
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