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Fire-resistant (UL 055 and ASTM-tested and A-rated) Water-resistant (freeze/thaw-tested for 36 months) Mold/fungus/bug free (non-nutritious to mold, fungus, insects ASTM G-21) Impact-resistant (ASTM D-5628) NYC approved (MEA # 359-02-M) Silica/asbestos free; STC-rated 53-54; Can be used in the place of traditional drywall or cement boards.
Lengths up to 16 feet (4.9 m) are common; the most common is 8 feet (2.4 m). Common thicknesses are 1 ⁄ 2 and 5 ⁄ 8 inch (13 and 16 mm); thicknesses of 1 ⁄ 4, 3 ⁄ 8, 3 ⁄ 4, and 1 inch (6, 10, 19, and 25 mm) are used in specific applications. In many parts of Canada, drywall is commonly referred to as Gyproc.
A gypsum block is made of gypsum plaster and water. The manufacturing process [1] is automated at production plants where raw gypsum (CaSO 4 ·2H 2 O) is ground and dried, then heated to remove three-quarters of the bound water and thus transformed into calcium sulfate hemihydrate (CaSO 4 ·½H 2 O), also known as gypsum plaster, stucco, calcined gypsum or plaster of Paris.
The International Building Code: 2603.5.2 [8] requires plastic foam insulation (e.g. Polystyrene foam, Polyurethane foam) to be separated from the building interior by a thermal barrier (e.g. drywall), regardless of the fire barrier provided by the central concrete.
Food sources for mold in buildings include cellulose-based materials such as wood, cardboard and the paper facing on drywall and organic matter such as soap, textiles, and dust containing skin cells. If a house has mold, the moisture may originate in the basement or crawl space, a leaking roof or a leak in plumbing pipes. [ 11 ]
The borates in cellulose insulation provide added control against mold. Installations have shown that even several months of water saturation and improper installation did not result in mold. [10] It is a common misconception that the mere presence of crude borates in cellulose insulation provides pest control properties to the product.
At the time, insurance language in policy contracts defining mold coverage was vague, and since mold remediation can cost between $10 to $25 per square foot, companies struggled to handle the ...
As a result of the high thermal resistance of the gas, spray polyurethane insulation typically has an initial R-value around R-3.4 to R-6.7 per inch. [6] In comparison, glass wool typically has an R-Value of only R-3 to R-4 per inch. [7] Foam insulation blocks all three forms of heat transfer: Conductive heat transfer
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