Asbestos cement

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A pre World War II house in Darwin, Australia. The roof is sheeted with corrugated fibro sheets and the walls with flat fibro sheeting, with fibro battens covering the joints. Fibro.JPG
A pre World War II house in Darwin, Australia. 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. Arcon mk post-war pre-fab.jpg
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.

Asbestos cement, genericized as fibro, fibrolite (short for "fibrous (or fibre) cement sheet"; but different from the natural mineral fibrolite), or AC sheet, is a composite building material consisting of cement and asbestos fibres pressed into thin rigid sheets and other shapes. [1]

Contents

Invented at the end of the 19th century, [2] the material was adopted extensively during World War II to make easily-built, sturdy and inexpensive structures for military purposes. It continued to be used widely following the war as an affordable external cladding for buildings. [3] Advertised as a fireproof alternative to other roofing materials such as asphalt, asbestos-cement roofs were popular, not only for safety but also for affordability. [4] Due to asbestos cement's imitation of more expensive materials such as wood siding and shingles, brick, slate, and stone, the product was marketed as an affordable renovation material. Asbestos cement competed with aluminum alloy, available in large quantities after WWII, and the reemergence of wood clapboard and vinyl siding in the mid to late 20th century.

Asbestos cement is usually formed into flat or corrugated sheets or into pipes, but can be molded into any shape that can be formed using wet cement. In Europe, cement sheets came in a wide variety of shapes, while there was less variation in the US, due to labor and production costs. Although fibro was used in a number of countries, in Australia and New Zealand its use was most widespread. Predominantly manufactured and sold by James Hardie until the mid-1980s, fibro in all its forms was a popular building material, largely due to its durability. The reinforcing fibres used in the product were almost always asbestos.

James Hardie and Wunderlich float ready for the Victory Day procession in Brisbane, 1946 StateLibQld 2 152895 James Hardie and Wunderlich float ready for the Victory Day procession in Brisbane, 1946.jpg
James Hardie and Wunderlich float ready for the Victory Day procession in Brisbane, 1946

The use of fibro that contains asbestos has been banned in several countries, including Australia, but as recently as 2016, the material was discovered in new components sold for construction projects. [5]

Health effects

When exposed to weathering and erosion, particularly when used on roofs, the surface deterioration of asbestos cement can release toxic airborne fibres. [6] [7] [8] Exposure to asbestos causes or increases the risk of several life-threatening diseases, including asbestosis, pleural mesothelioma (lung), and peritoneal mesothelioma (abdomen).

Safer asbestos-free fibre cement sheet is still readily available, but the reinforcing fibres are cellulose. [9] The name "fibro" is still traditionally applied to fibre cement.

Products used in the building industry

Roof sheeting, known as Hardies "Super Six" Corrugated-fibro-roofing.jpg
Roof sheeting, known as Hardies "Super Six"

Cleaning of asbestos cement

Some Australian states, such as Queensland, prohibit the cleaning of fibro with pressure washers, because it can spread the embedded asbestos fibres over a wide area. Safer cleaning methods involve using a fungicide and a sealant. [12]

The 1973 song, "Way Out West", by The Dingoes, later covered by James Blundell & James Reyne, mentions living in a "house made of fibro cement". Fibro is also referred to several times on the Australian TV show Housos .

See also

Related Research Articles

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A roof is the top covering of a building, including all materials and constructions necessary to support it on the walls of the building or on uprights, providing protection against rain, snow, sunlight, extremes of temperature, and wind. A roof is part of the building envelope.

<span class="mw-page-title-main">Siding (construction)</span> Exterior cladding on building walls

Siding or wall cladding is the protective material attached to the exterior side of a wall of a house or other building. Along with the roof, it forms the first line of defense against the elements, most importantly sun, rain/snow, heat and cold, thus creating a stable, more comfortable environment on the interior side. The siding material and style also can enhance or detract from the building's beauty. There is a wide and expanding variety of materials to side with, both natural and artificial, each with its own benefits and drawbacks. Masonry walls as such do not require siding, but any wall can be sided. Walls that are internally framed, whether with wood, or steel I-beams, however, must always be sided.

<span class="mw-page-title-main">Transite</span>

Transite originated as a brand that Johns Manville, an American company, created in 1929 for a line of asbestos-cement products, including boards and pipes. In time it became a generic term for other companies' similar asbestos-cement products, and later an even more generic term for a hard, fireproof composite material, fibre cement boards, typically used in wall construction. 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.

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<span class="mw-page-title-main">Fiber cement siding</span> Building material used to cover the exterior of a building

Fiber cement siding is a building material used to cover the exterior of a building in both commercial and domestic applications. Fiber cement is a composite material made of cement reinforced with cellulose fibers. Originally, asbestos was used as the reinforcing material but, due to safety concerns, that was replaced by cellulose in the 1980s. Fiber cement board may come pre-painted or pre-stained or can be done so after its installation.

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<span class="mw-page-title-main">Fibre cement</span> Type of composite construction material

Fibre cement is a composite building and construction material, used mainly in roofing and facade products because of its strength and durability. One common use is in fiber cement siding on buildings.

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References

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