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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. Translucent concrete - Wikipedia

   en.wikipedia.org/wiki/Translucent_concrete

   Translucent concrete (also: light-transmitting concrete) is a concrete based building material with light-transmissive properties due to embedded light optical elements — usually optical fibers. Light is conducted through the stone from one end to the other.

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5. Polycarbonate - Wikipedia

   en.wikipedia.org/wiki/Polycarbonate

   BPA is a compound that is currently on the list of potential environmental hazardous chemicals. It is on the watch list of many countries, such as United States and Germany. [35]-(-OC 6 H 4) 2 C(CH 3) 2 CO-)-n + H 2 O → (CH 3) 2 C(C 6 H 4 OH) 2 + CO 2

6. Types of concrete - Wikipedia

   en.wikipedia.org/wiki/Types_of_concrete

   Many factors need to be taken into account, from the cost of the various additives and aggregates, to the trade offs between the "slump" for easy mixing and placement and ultimate performance. A mix is then designed using cement (Portland or other cementitious material), coarse and fine aggregates, water and chemical admixtures. The method of ...

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