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Structural concrete can also be used for flat roof constructions. There are three main categories, precast/prestressed, cast-in-place and shell. There are many types of precast/prestressed concrete roofing. The following are the most common types. [9] Double tees are the most common products for short spans up to 60 feet (18 m)
Front cover of a brochure for Hatscheks Eternit Schiefer (asbestos cement roof tiles) Fibre-reinforced cement products were invented in the late 19th century by the Austrian Ludwig Hatschek . Principally he mixed 90% Portland cement and 10% asbestos fibres with water and ran it through a cardboard machine.
Fire-retardant materials are designed to burn slowly.. Fire-retardant materials should not be confused with fire-resistant materials. A fire resistant material is one which is designed to resist burning and withstand heat.
He mixed 90% cement and 10% asbestos fibres with water and ran it through a cardboard machine, forming strong thin sheets. Originally, the reinforcing fibres were of asbestos and the material was commonly used as siding in house buildings due to its low cost, fire-resistance, water tightness, light weight, and other useful properties.
It can also be found in insulation, siding, roof gutters, and cement wallboard. The more prevalent transite found in wall construction and roofing tiles for example, will last anywhere from 50 years to over 100 years. [citation needed] The use of asbestos, a proven carcinogen, to manufacture transite was phased out in the 1980s.
Autoclaved aerated concrete (AAC) is a lightweight, prefabricated concrete building material. Developed initially in the mid-1920s, it has expanded into widespread use. [citation needed] It is most suitable for producing a lightweight or most cost-effective alternative to traditional concrete blocks and clay bricks. [1]
Gypsum concrete is lightweight and fire-resistant. A 1.5-inch slab of gypsum concrete weighs 13 pounds per square foot versus 18 pounds per square foot for regular concrete. [10] Even though gypsum concrete weighs less, it still has the same compressive strength as regular concrete, based on its application as underlayment or top coat flooring ...
The roof is sheeted with corrugated fibro sheets and the walls with flat fibro sheeting, with fibro battens covering the joints. Example of asbestos cement siding and lining on a post-war temporary house in Yardley, Birmingham. Nearly 40,000 of these structures were built between 1946 and 1949 to house families.
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