InstaBidsWhat is plaster?
Plaster is a coating applied wet to walls and ceilings that hardens into a finished surface. Interior plaster commonly uses lime or gypsum.
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What is plaster made of?
Plaster recipes vary. Traditional lime plaster combines a binder, aggregate, reinforcing fiber and water; the National Park Service describes that historic mixture as follows. “Lime plaster was made from four ingredients: lime, aggregate, fiber, and water.” Source: U.S. National Park Service, read 2026-10-30.
What is the meaning of plaster as an architectural finish?
In a home, plaster means an applied architectural finish covering walls or ceilings. The National Park Service uses the term for both interior and exterior finishes. “Today the term “plaster,” and its derivations, is synonymous with a very specific architectural finish for interior and/or exterior applications.” Source: U.S. National Park Service, read 2026-10-30.
What is gypsum plaster?
Gypsum plaster uses heated gypsum mixed with water to form a setting material. The National Park Service connects this material to plaster of Paris and explains when curing begins. “The Egyptians used a plaster made from calcined (heated) gypsum – much like modern Plaster of Paris [1].” Source: U.S. National Park Service, read 2026-10-30. “Gypsum begins to cure as soon as it is mixed with water.” Source: U.S. National Park Service, read 2026-10-30.
What is veneer plaster?
Veneer plaster is a thin plaster finish covering the wall surface. The National Park Service describes a 1/16-inch layer applied across the entire wall. “After the tape is bedded, a thin, 1/16-inch coat of high-strength veneer plaster is applied to the entire wall surface.” Source: U.S. National Park Service, read 2026-10-30.
What is ornamental plaster?
Ornamental plaster is plaster shaped into decorative details. Historic production used two approaches: forming profiles at the building or casting pieces in workshop molds. “Historically, ornamental plasterwork has been produced in two ways: it would be run in place (or on a bench) at the site; or cast in molds in a workshop.” Source: U.S. National Park Service, read 2026-10-30.
What happens when plaster walls get wet?
Persistent moisture can damage plaster. On masonry walls, dissolved salts can move to the plaster surface and appear as dry bubbles or efflorescence, a salt deposit. “When salts from the masonry substrate come in contact with water, they migrate to the surface of the plaster, appearing as dry bubbles or efflorescence.” Source: U.S. National Park Service, read 2026-10-30.
Sources
- Preservation Brief 21: Repairing Historic Flat Plaster—Walls and Ceilings — U.S. National Park Service; published 1989-10; read 2026-10-30.
- Should I Replace My Plaster Ceiling? — U.S. National Park Service; published 2014; read 2026-10-30.
- Preservation Brief 23: Preserving Historic Ornamental Plaster — U.S. National Park Service; read 2026-10-30.