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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. Twinwall plastic - Wikipedia

   en.wikipedia.org/wiki/Twinwall_plastic

   Although single layer polycarbonate sheeting is more flexible than polycarbonate in twinwall configuration, it still retains significant advantages over alternative materials, including glass. A typical 6mm sheet has a density of 0.72 g/cm^2 [6] and a thermal insulation R value of 0.3 m^2°C/W, while allowing 80% of visible light pass through. [7]

4. USG Corporation - Wikipedia

   en.wikipedia.org/wiki/USG_Corporation

   In 1940, the U.S. Justice Department filed suit against USG and six other wallboard manufacturers, charging them with price fixing under §§ 1 and 2 of the Sherman Act. The claim stemmed from US Gypsum's 1929 cross-licensing agreements for its patented wallboard, which set prices at which the wallboard must be sold.

5. Roof tiles - Wikipedia

   en.wikipedia.org/wiki/Roof_tiles

   Dating to the 1840s, interlocking tiles are the newest category of roofing tile and one of the widest ranging in appearance. [4] Their distinguishing feature is the presence of a ridge for interlocking with one another. This allows them to provide a high ratio of roof area to number of tiles used.

6. Polycarbonate - Wikipedia

   en.wikipedia.org/wiki/Polycarbonate

   Polycarbonate has a glass transition temperature of about 147 °C (297 °F), [8] so it softens gradually above this point and flows above about 155 °C (311 °F). [9] Tools must be held at high temperatures, generally above 80 °C (176 °F) to make strain-free and stress-free products.

7. Chicago Metallic Corporation - Wikipedia

   en.wikipedia.org/wiki/Chicago_Metallic_Corporation

   The company was noted by the Chicago Tribune as “one of the largest global manufacturers and suppliers of roll-formed ceiling grid, stamped metal decorative ceiling panels and related products”. [1] The company was owned by the Jahn family from 1938 to 2013. On August 19, 2013, the company was acquired by Rockwool International. The ...