Hybrid plaster systems consisting of a Portland cement plaster base with a synthetic plaster finish coat provide the benefits of Portland cement plaster with a more weather-resistant finish. In order to prevent damage caused by cracking and water absorption an elastomeric coating can be applied over the plaster. Portland cement plaster loses up to 4 percent of its original volume as it dries, Thus, even with proper control joint placement cracking often occurs. – Vertically above and below each side or openings. – To limit each area of plaster to 144 square feet or 12 feet on center maximum. In general control joints should be placed: These General Specifications for Plastering & Painting is an excerpt from the Technical Specifications which have been adopted from the General specifications of the Institute for Construction Training and Development of Sri Lanka, with their permission, for use in the Hulhumal Project. Other finishes can be added.Ĭorner beads are required to prevent damage to external corners.Ĭasing beads are placed where plaster stops or abuts dissimilar materials or stops with the edge exposed.Ĭontrol joints must be installed to minimize cracking. Numerous manufacturers offer synthetic plaster finishes, Due to the wide variety of available products these are not included in this section but can be added.Ī wide range of finishes are available for Portland cement plaster, the most common of which are included in this section. Water absorption is minimized by the use of a proprietary finish coat or the application of paint. Cracking can be minimized by the proper placement of control joints. The roofing materials shall be loaded onto the roof and interior wallboard stocked in the. Substrates shall comply with local code requirements and practices for use under cement plaster and shall be: 1) Poured in place or precast concrete. Portland cement plaster is susceptible to cracking and to water absorption when used as an exterior finish. Commercial Cement Plaster 1 Specifications DS819. Portland cement plaster provides a durable exterior finish that can be left exposed to the weather. Portland cement plaster for exterior and interior wall and soffit finishes consists of two or more coats of cement-based plaster applied over metal lath or a solid substrate such as concrete or masonry. This product is sometimes referred to as “stucco”. for plastering internal walls, that will be painted or covered with wallpaper, material should be declared as lime-cement mortar and classified at least as CS I. Utilize this section to specify Portland cement plastering for use for wall, ceiling, and soffit finishes.
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