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In use as early as 1900, rock lath (also known as "button board," "plaster board" or "gypsum-board lath"), is a type of gypsum wall board (essentially an early form of drywall) with holes spaced regularly to provide a 'key' for wet plaster. [3] Rock lath was typically produced in sheets sized 2 by 4 feet (610 by 1,220 mm).
Various sized cuts of 1 ⁄ 2 in (13 mm) drywall with tools for maintenance and installation . Drywall (also called plasterboard, dry lining, [1] wallboard, sheet rock, gib board, gypsum board, buster board, turtles board, slap board, custard board, gypsum panel and gyprock) is a panel made of calcium sulfate dihydrate (), with or without additives, typically extruded between thick sheets of ...
Asbestos (/ æ s ˈ b ɛ s t ə s, æ z-,-t ɒ s / ass-BES-təs, az-, -toss) [1] is a group of naturally occurring, toxic, carcinogenic and fibrous silicate minerals.There are six types, all of which are composed of long and thin fibrous crystals, each fibre (particulate with length substantially greater than width) [2] being composed of many microscopic "fibrils" that can be released into ...
Asbestos litigation is the longest, most expensive mass tort in U.S. history, involving more than 8,000 defendants and 700,000 claimants. [1] By the early 1990s, "more than half of the 25 largest asbestos manufacturers in the US, including Amatex, Carey-Canada, Celotex, Eagle-Picher, Forty-Eight Insulations, Manville Corporation, National Gypsum, Standard Insulation, Unarco, and UNR Industries ...
Lath has expanded to mean any type of backing material for plaster. This includes metal wire mesh or expanded metal that is applied to a wood or metal framework as matrix over which stucco or plaster is applied, as well as drywall products called gypsum or rock lath. [2] Historically, reed mat was also used as a lath material.
Plaster that contains powdered silica or asbestos presents health hazards if inhaled repeatedly. Asbestos is a known irritant when inhaled and can cause cancer, especially in people who smoke, [ 26 ] [ 27 ] and inhalation can also cause asbestosis .
Despite asbestos-containing transite being phased out, it is still not banned in the United States; some 230,000 deaths have been attributed to it. [ citation needed ] Demolition of older buildings containing transite materials, particularly siding made from transite, requires special precautions and disposal techniques to protect workers and ...
The regulations did not prohibit the continued use of asbestos-containing materials that were already in place such as asbestos-cement roof sheets or ceilings, the department was satisfied that there was "no undue risk" and they would be replaced in due time.