The brown (second) coat then adds mass and surface to the plaster, followed by applying the finish (third) coat over a partially dry basecoat. The scratch (first) coat establishes the bond, or keys, with the base substrate. Three-coat work: A three-coat system is generally used with metal lath or direct masonry bases. The finish coat can be applied so that it creates either a smooth or a textured surface. Two-coat work: If using a two-coat conventional plaster system, the base (first) coat is applied to the gypsum lath or masonry base, leaving the surface sufficiently rough and porous to provide a suitable bond of the finish (second) coat. Sculpting and casting decorative objectsĬonventional plaster involves applying several layers of plaster to a surface, building up the thickness until the desired level is achieved.Today, conventional plaster systems continue to provide smooth, high-quality wall surfaces, regardless of framing alignment. “Its installation is similar to regular gypsum board and the face paper is specially designed to receive plaster.”Ī predecessor of drywall, conventional lath and plaster systems, or wet wall systems were once the industry standard in wall and ceiling construction. “Kal-Kore Plaster Base is simple to use and easier to install compared to metal lath,” said Chapman. For speed of installation, GridMarX® installation guide marks are printed on the face paper. Kal-Kore Plaster Base is a tapered-edge gypsum plasterboard with an absorptive face paper designed to permit rapid trowel application and a strong bond of the plaster. Gypsum lath, such as Gold Bond® Kal-Kore® Plaster Base, is a durable substrate for both conventional and veneer plaster. Metal lath provides a matrix to which conventional plaster can embed, allowing “keys” to form as the plaster pushes through the holes in the metal to create a mechanical bond. While historic plaster walls and ceilings used thin, wooden lath strips to form a base for applying plaster, modern lath used for a conventional plaster application is most often made of metal or gypsum. In addition, all gypsum plasters are noncombustible and act to prevent the passage of intense heat from fire for extended periods. However, conventional plaster’s additional thickness makes it more durable and longer lasting than veneer plaster, especially in high-traffic areas. The overall application of a veneer plaster is faster and easier than conventional plaster, making it a popular choice for modern construction projects. One-coat veneer plaster systems are applied over gypsum lath, while two-coat veneer plaster systems may be applied over masonry or gypsum lath.
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