Knowra Plaster Plaster Plaster is a workable paste applied to walls and ceilings that hardens into a durable coating. It is made from mineral binders mixed with water and often aggregates or fibers.
Gypsum plaster : A plaster made by mixing water with calcined gypsum, which sets as the gypsum rehydrates. Its rapid hydration makes it a common interior wall and ceiling coating.
Calcium sulfate hemihydrate : A partially dehydrated form of calcium sulfate that reacts with water to form gypsum. It is the reactive powder in conventional gypsum plaster.
Plastering : The craft of applying plaster to walls, ceilings, and other surfaces. It encompasses the techniques used to spread, level, and finish plaster coats.
Drywall : A construction panel with a gypsum core and paper facings, used to form interior walls and ceilings. Unlike wet-applied plaster, it creates a wall surface from factory-made panels.
Lime plaster : A plaster made chiefly from lime and aggregate that hardens through carbonation or hydraulic reactions. Its binder hardens differently from gypsum, shaping its curing time and moisture behavior.
Calcium hydroxide : An alkaline compound produced by slaking quicklime with water. It is the principal binder in nonhydraulic lime plaster before carbonation.
Lath and plaster : A wall or ceiling system in which plaster is applied over narrow supporting strips called laths. It shows how plaster can form a surface over a framed support.
Mortar : A workable mixture of binder, water, and aggregate used to bond masonry units or fill joints. Mortar is formulated for masonry bonding, while plaster is generally a surface coating.
Hydraulic lime : A lime binder that sets through reactions with water as well as carbonation. It lets some lime plasters harden in damp conditions where air-lime carbonation is slow.
Sand : A granular material composed mainly of mineral particles, commonly used as a construction aggregate. Its grain size and proportion affect the texture and shrinkage of plaster.
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