![]() Plaster is directly applied to rough masonry or to lath over furring or framework. Ornamental plastering is the art of creating decorative profiles and sculptural shapes in relief like cornices, moldings, and medallions. These plasters used a variety of recipes and additives like animal glue and pigments to augment properties like moldability, strength, color, and aesthetics.įlat or plain plastering is the application of 1 to 3 coats of plaster to create a smooth, neat finish. ![]() Specialty ornamental plasters like Scagliola and Composition Ornament flourished between the 17th and 19th centuries and were often created to imitate stone and carved woodwork. Ornamental elements are typically cast into molds and applied to an architectural surface after curing. Historically, plaster would serve as a surface finish or as a substrate for paint or wallpaper. In these applications, the material is applied wet and finished when hardened as an interior finish primarily for walls and ceilings. The most common constituents are gypsum, lime, or cement materials to form the matrix, blended with fine aggregates and fibers, depending on the application.įor flat and detailed surfaces like walls, ceilings and cornices, plaster is commonly mixed and formed onsite or pre-cast and installed. A variety of plaster types have been used throughout history, characterized by composition and application. Plaster is an interior finish that aids in noise reduction and fireproofing and can be an integral aspect of a historic interior.
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