Gypsum board in the context of "Lath and plaster"

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⭐ Core Definition: Gypsum board

Drywall (also called plasterboard, dry lining, 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 (gypsum), with or without additives, typically extruded between thick sheets of facer and backer paper, used in the construction of interior walls and ceilings. The plaster is mixed with fiber (typically paper, glass wool, or a combination of these materials); plasticizer, foaming agent; and additives that can reduce mildew, flammability, and water absorption.

In the mid-20th century, drywall construction became prevalent in North America as a time- and labor-saving alternative to lath and plaster.

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Gypsum board in the context of Vapor barrier

A vapor barrier (or vapour barrier) is any material used for damp proofing, typically a plastic or foil sheet, that resists diffusion of moisture through the wall, floor, ceiling, or roof assemblies of buildings and of packaging to prevent interstitial condensation. Technically, many of these materials are only vapor retarders as they have varying degrees of permeability.

Materials have a moisture vapor transmission rate (MVTR) that is established by standard test methods. One common set of units is g/m·day or g/100in·day. Permeability can be reported in perms, a measure of the rate of transfer of water vapor through a material (1.0 US perm = 1.0 grain/square-foot·hour·inch of mercury ≈ 57 SI perm = 57 ng/s·m·Pa). American building codes started classifying vapor retarders in the 2007 IRC supplement. They are Class I <0.1 perm, Class II 0.1 - 1 perm and Class III 1-10 perm when tested in accordance with the ASTM E96 desiccant, dry cup or method A. Vapor-retarding materials are generally categorized as:

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LINKED FROM (PARENTS)
← Vapor barrier
LINKS TO (CHILDREN)
Calcium sulfate → Hydrate → Gypsum → Paper → Construction → Fiber → Glass wool → Plasticizer → Foaming agent → Mildew → Combustibility and flammability → Lath and plaster →