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2. List of commercially available roofing materials - Wikipedia

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

   Stone slabs require a very heavyweight roof structure, but their weight makes them stormproof. An obsolete roofing material, now used commercially only for building restoration. Collyweston stone slate named after the village of Collyweston; Solar shingle; Metal shakes or shingles. Long life. High cost, suitable for roofs of 3:12 pitch or greater.

3. Dymalloy - Wikipedia

   en.wikipedia.org/wiki/Dymalloy

   Dymalloy is a metal matrix composite of 20% copper and 80% silver alloy matrix with type I diamond. [1] It has a very high thermal conductivity of 420 W/(m·K), and its thermal expansion can be adjusted to match other materials, e.g., silicon and gallium arsenide chips.

4. Asphalt roll roofing - Wikipedia

   en.wikipedia.org/wiki/Asphalt_roll_roofing

   Asphalt roll roofing or membrane is a roofing material commonly used for buildings that feature a low sloped roof pitch in North America. The material is based on the same materials used in asphalt shingles ; an organic felt or fiberglass mat, saturated with asphalt , and faced with granular stone aggregate.

5. Flat roof - Wikipedia

   en.wikipedia.org/wiki/Flat_roof

   A flat roof is the most cost-efficient roof shape as all room space can be used fully (below and above the roof). Having a smaller surface area, flat roofs require less material and are usually stronger than pitched roofs. [27] This style roof also provides ample space for solar panels or outdoor recreational use such as roof gardens.

6. Hummers, Cadillacs, and More of the Biggest Cars Ever Made - AOL

   www.aol.com/50-biggest-cars-ever-made-110000486.html

   It's named after the Cullinan Diamond, which explains the 3-ton, 17.5-foot SUV's $348,500 starting price. So does the 6.75-liter, 563-horsepower twin-turbo V-12 Rolls-Royce engine; bespoke key ...

7. Sandwich-structured composite - Wikipedia

   en.wikipedia.org/wiki/Sandwich-structured_composite

   1) In materials science, a sandwich-structured composite is a special class of composite materials that is fabricated by attaching two thin-but-stiff skins to a lightweight-but-thick core. The core material is normally of low strength, but its greater thickness provides the sandwich composite with high bending stiffness with overall low density .