It can be used to provide highlights, depth, continuity, and segmentation, and by the plaster installer’s techniques during and after application of the finish coat plaster.įire Resistance Properties of Portland Cement-based plasterįire resistance is typically classified by a fire rating, but what kind of fire rating does plaster provide? Texture gives substance and character to the plaster surface. Texture is achieved by selecting aggregate size, controlling finish mix consistency, and using special treatment techniques during and after application of the finish coat plaster. Pre-pigmented packaged cements also can be used to achieve the desired stucco color or pre-weighed mineral oxide pigments can be added to the finish coat stucco during mixing. In many areas, factory-prepared finish-coat products are available. A vapor-permeable, water-resistant building paper separates the plaster and lath from water sensitive sheathing or framing.Ĭolor is determined by selecting cement and aggregate color, and quite often modified by adding mineral oxide pigments to the plaster mix. When applied to metal lath, three coats of plaster form a 7/8-inch total thickness. It may be applied directly to a solid base such as masonry or concrete walls or applied to a metal lath attached to frame construction, solid masonry, or concrete construction. Portland cement plaster is applied either by hand or machine to exterior and interior wall surfaces in two or three coats. Plaster can be a desirable facing material: hard, strong, and most of all, fire-resistant. It’s advantages include utility, relatively low first cost, and minimum need for maintenance. Admixtures may be added to for various purposes including workability. Exterior cement plaster (stucco) is an exterior finish consisting of portland cement, sand, mixed with water to form a workable plaster.
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