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2. Metal roof - Wikipedia

   en.wikipedia.org/wiki/Metal_roof

   This allowed the sheet iron to be self-supporting when used as a roof; a contemporary account praised the material as "the lightest and strongest roof (for its weight) since the days of Adam". [7] After Palmer's patent expired in 1843, corrugated galvanized iron (CGI) became a world-wide favorite roofing material. [7]

3. List of commercially available roofing materials - Wikipedia

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

   Roofing material is the outermost layer on the roof of a building, sometimes self-supporting, but generally supported by an underlying structure. A building's roofing material provides shelter from the natural elements. The outer layer of a roof shows great variation dependent upon availability of material, and the nature of the supporting ...

4. Superhard material - Wikipedia

   en.wikipedia.org/wiki/Superhard_material

   A material is also considered hard if it resists plastic deformation. If a material has short covalent bonds, atomic dislocations that lead to plastic deformation are less likely to occur than in materials with longer, delocalized bonds. If a material contains many delocalized bonds it is likely to be soft. [10]

5. The world’s strongest material could be used to make clean ...

   www.aol.com/news/world-strongest-material-could...

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6. Architectural metals - Wikipedia

   en.wikipedia.org/wiki/Architectural_metals

   Copper belfry of St. Laurentius church, Bad Neuenahr-Ahrweiler Metals used for architectural purposes include lead, for water pipes, roofing, and windows; tin, formed into tinplate; zinc, copper and aluminium, in a range of applications including roofing and decoration; and iron, which has structural and other uses in the form of cast iron or wrought iron, or made into steel.

7. Hardnesses of the elements (data page) - Wikipedia

   en.wikipedia.org/wiki/Hardnesses_of_the_elements...

   Unsourced material may be challenged and removed. Find sources: "Hardnesses of the elements" data page – news · newspapers · books · scholar · JSTOR ( June 2022 ) ( Learn how and when to remove this message )