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2. List of commercially available roofing materials - Wikipedia

   en.wikipedia.org/wiki/List_of_commercially...

   Metal roofing is any of a large variety of roof coverings made from metal and is characterized by its high resistance, impermeability, and longevity. While there are an infinite variety of how to produce metal roofing, thicknesses, and types for metal/finishes used, roofing is generally grouped into 2 categories: Exposed Fastener Panels and ...

3. Metal roof - Wikipedia

   en.wikipedia.org/wiki/Metal_roof

   A lightweight roof is very useful for large or old structures, as it helps to maintain the overall structural integrity of the building. [14] Despite its light weight, metal roofing provides increased wind resistance when compared to other roofing materials. This is because metal roofing systems use interlocking panels.

4. List of screw and bolt types - Wikipedia

   en.wikipedia.org/wiki/List_of_screw_and_bolt_types

   Sheet metal screws make excellent fasteners for attaching metal hardware to wood because the fully threaded shank provides good retention in wood. Twinfast screw: A Twinfast screw is a type of screw with two threads (i.e. a twin-start screw), so that it can be driven twice as fast as a normal (i.e. single-start) screw with the same pitch. [4]

5. English wheel - Wikipedia

   en.wikipedia.org/wiki/English_wheel

   High crown panels/sections may need to be annealed due to work-hardening of the metal, which makes it brittle unworkable and liable to fracture. After achieving the correct basic shape with the correct amount of metal in the right places, the worker must blend the edges of high crown areas with low crown areas, so that the surface contour ...

6. Nail (fastener) - Wikipedia

   en.wikipedia.org/wiki/Nail_(fastener)

   Panel pin; Gutter spike – Large long nail intended to hold wooden gutters and some metal gutters in place at the bottom edge of a roof; Ring (annular, improved, jagged) shank nail – nails that have ridges circling the shank to provide extra resistance to pulling out

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