![]() ![]() Installation ASTM C842 Standard Specification for Application of Interior Gypsum PlasterĪrchitectural Spec 09 21 Plaster and Gypsum Board Assemblies. The grout must be raked out to allow lath and plaster to be inserted into the frame. ![]() Dampen trim return vibration by grouting, and by using special anchors. The interior side of exterior walls should be furred and lathedprior to plastering to prevent seepage and condensation.īasecoat plasters must not die or stop against a hollow metal door frame return. Plaster application on masonry or concrete walls, or ceilings that have been coated with bituminous compounds or other waterproofing agents, are not recommended. Gypsum plasters should not be used where they will come into contact with water or excessive moisture. Over interior monolithic concrete, a plaster bonder must be applied before plastering. Where sound isolation is the prime consideration, only sand aggregate should be used. Not recommended for use with perlite aggregate when machine applied, with vertical lift over 30 ft. A partial list of associations, and their links is provided on the home page of this site.Ĭomposition Gypsum plasters requiring the addition of aggregates consisting of either sand, vermiculite, or perliteĪpplication Interior walls and ceilings over metal or gypsum lathĬompliance ASTM C28 Standard Specification for Gypsum Plasters For more and the latest information relative to these limitations, it is recommended to contact either the representative association or a specific building product manufacturer. Note: The limitations provided here are taken from appropriate building product manufacturer's source. Both types are considered a “wet” application for they arrive on site in powder form where they are mixed and applied to a substrate in a wet state. Veneer plaster has the option of being applied in a two coat plaster (basecoat and finish) or in a finish only. The second type of plaster is a special adaptation of conventional and is called veneer plaster. ![]() The third and final coat is called a finish plaster. The plaster used in the first two coats is called a basecoat plaster. It is a three-coat process where the plaster is applied over the substrate in three successive applications. The first type is conventional plaster, and has been used successfully for many years. There are two types of gypsum plaster that are in use today. This discussion on plaster will focus on gypsum plaster. Since gypsum will degrade after continued exposure to water it is used exclusively on the interior of a building. Portland cement plaster is commonly called stucco, and because of its resistance to degradation in the presence of water it is primarily used in exterior environments or in interior wet areas such as gang showers. Plaster can be Portland cement or gypsum based in its composition. There are two basic types of plaster, and they vary by base material. Plaster is a traditional method for providing a very durable finish that offers design flexibility in the finished appearance. ![]()
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