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  2. Roof seamer - Wikipedia

    en.wikipedia.org/wiki/Roof_seamer

    A roof seamer is a development that replaced a manual process and hand tools of the past. A hammer and small anvil were tools that were used for hemming and seaming roof panels together at the edge where they meet with the next roof panel in sequence. In 1976, a German immigrant and inventor, Ewald Stellrecht, [1] helped develop an early ...

  3. Hemming and seaming - Wikipedia

    en.wikipedia.org/wiki/Hemming_and_seaming

    hemming process A closed hem A seam. Hemming and seaming are two similar metalworking processes in which a sheet metal edge is rolled over onto itself. Hemming is the process in which the edge is rolled flush to itself, while a seam joins the edges of two materials.

  4. List of commercially available roofing materials - Wikipedia

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

    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.

  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. Metal roof - Wikipedia

    en.wikipedia.org/wiki/Metal_roof

    A metal roof is a roofing system featuring metal pieces or tiles exhibiting corrosion resistance, impermeability to water, and long life. It is a component of the building envelope . The metal pieces may be a covering on a structural, non-waterproof roof, or they could be self-supporting sheets.

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