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2. 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 ...

3. Canopy (architecture) - Wikipedia

   en.wikipedia.org/wiki/Canopy_(architecture)

   Canopy over a doorway in Fergana, Uzbekistan Canopied entrance to the New York City Subway at the 14th Street–Union Square station. A canopy is a type of overhead roof or else a structure over which a fabric or metal covering is attached, able to provide shade or shelter from weather conditions such as sun, hail, snow and rain.

4. Earth shelter - Wikipedia

   en.wikipedia.org/wiki/Earth_shelter

   Therefore, earth shelters do not tend to have flat roofs. A flat roof is also less resistant to the weight of the earth. It is common for earth shelter designs to have arches and shallow domed roofs since this form resists vertical load well. One method uses finely meshed metal bent into the intended shape and welded to the supporting armature.

5. 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.

6. Building material - Wikipedia

   en.wikipedia.org/wiki/Building_material

   Steel is a metal alloy whose major component is iron, and is the usual choice for metal structural building materials. It is strong, flexible, and if refined well and/or treated lasts a long time. The lower density and better corrosion resistance of aluminium alloys and tin sometimes overcome their greater cost .

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