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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. Polycarbonate - Wikipedia

   en.wikipedia.org/wiki/Polycarbonate

   A major polycarbonate market is the production of compact discs, DVDs, and Blu-ray discs. [13] These discs are produced by injection-molding polycarbonate into a mold cavity that has on one side a metal stamper containing a negative image of the disc data, while the other mold side is a mirrored surface.

5. 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 ...

6. Area codes 630 and 331 - Wikipedia

   en.wikipedia.org/wiki/Area_codes_630_and_331

   On October 7, 2007, area code 331 began overlaying area code 630, making ten-digit dialing mandatory in the area. The Illinois side of the Chicago area–312/773/872, 708, 847/224, 630/331 and portions of 815/779–is one of the largest local calling areas in the United States; with few exceptions, no long-distance charges are applied from one ...

7. Community areas in Chicago - Wikipedia

   en.wikipedia.org/wiki/Community_areas_in_Chicago

   Chicago is traditionally divided into the three "sides" of the North Side, West Side, and South Side by the Chicago River. These three sides are represented by the white stripes on the Flag of Chicago. [12] The city is also divided into 50 wards for the purpose of electing one alderman each to the Chicago City Council. These wards have at times ...