See www.astm.org for information about ordering a copy of ASTM C926, which contains the recommendations for both vertical and horizontal plaster thickness over metal plaster bases and solid plaster bases. Building paper should comply with the current requirements of UU-B-790a, Federal Specifications for Building Paper, Vegetable Fiber (Kraft, Waterproofed, Water Repellent, and Fire Resistant). Fiber reinforced Perlite cement plaster basecoats accept a wide variety of finishes such as cementitious color and texture coats, stucco, polymerized cementitious coatings, tile, or masonry veneer. Plaster of paris has been used as a mould making medium and also for coving , once mixed unlike cement plaster of paris sets very quickly . After placing paper over the face of the ICF, metal lath is mechanically fastened to the furring strips. Portland cement-based plaster, commonly called stucco, has long been and continues to be a popular choice for finishes on buildings. and plasters are used for rendering on the outside and inside of walls. You can look to your local Yellow Pages, The Blue Book of Construction, or at your local library to identify contractors in your area. (EIMA) may provide additional information on finishing and details. Ensure all the checks ( Brickwork Checklist ) after block work is completed. While some may classify stucco or plaster as utilizing separate binding materials (e.g. Now that we are seeing cold weather, are there any restrictions on plastering at lower temperatures? Cement plaster is made by mixing cement and sand in the proportions required. Traditional portland cement plaster is an extremely versatile, time-tested exterior finish, frequently referred to as “stucco.” It consists of portland cement-based materials and sand, mixed with water to form a workable plaster. 8.5 ltrs per 50 kg bag). It provides an economical hard surface that is rot, rust, and fire resistant, which can be colored and finished in a wide range of textures to adorn any architectural style. In this approach, the idea is to treat the plaster like a sheathed system, using metal lath to support the plaster on the substrate, while completely isolating the plaster layer from the backup with building paper. Currently, per the building code, a portland cement plaster is only required to have a weather resistant barrier (WRB) behind it, which is satisfied by the ICF; hence, building paper would not necessarily be required. Then, add another bag of sand and more water. No matter if the joint is called a control joint, a contraction joint, or an expansion joint, it is there to relieve stresses. This is generally not a concern with new masonry walls, but can be an issue with new cast-in-place concrete as it may have residual form release agent on its surface. The shapes must be securely attached to the wall. All of the textures can be made with gray or white cement, with or without pigments. In this online Cement sand quantity for plastering calculator enter the area of plastering to be done, ratio of plastering and the level of thickness you wish to do the plastering and submit to know the cement required in bags and sand required. Building paper prevents moisture-related problems in stucco walls. Paint primer and final two paint coats are not required. It is important to note that the term “cement” includes all cementitious materials, such as cement plus lime. The following documents contain tables of mixture proportioning recommendations: It is not impossible to handle plastering repairs as a do-it-yourself project, but it is a fairly large undertaking for the average person. The association is is located at 513 W. Broad St, Suite 210 in Falls Church, Virginia, 22046. Stucco that is direct applied to concrete or masonry requires contraction joints only where there is a change in material or where there are joints in the concrete or masonry structure. feet, depending on what texture … How to make portland based (exterior) stucco from scratch in a wheelbarrow. ASTM C1063, Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster, provides guidance on the size of metal lath, number and length of fasteners, and appropriate spacing of contraction joints. In two coat work, there is a single base coat and a finish coat. It allows for a wide expression of aesthetics, is a cost effective finish, is durable in all types of climates (especially wet ones), and offers fire resistance. The below plastering work checklist and procedure will be useful for any type plastering work. Those materials already contain workability agents and the addition of lime is neither necessary nor allowed. That is why this site is so beneficial: it provides visual depictions of each finish to prevent misinterpretations that might occur with verbal descriptions. Most dirt is removed fairly easily. It should include building paper, metal lath, and three-coat portland cement plaster. Available Regionally. Association of the Wall and Ceiling Industry, Association of the Wall and and Ceiling Industry. 2: Cement plaster is not considered as save from fungus malts et cetera. Some specifiers are turning to house wraps for stucco underlayment. This cement rich slurry is dashed against the base surface by hand with a brush, trowel or paddle, or by machine. This specification differentiates weather resistive Kraft papers by types, grades, and styles. Cement Stucco . Flexible acrylic finishes … Pour 1 part plastic cement and 4 parts masonry sand into a wheelbarrow and blend everything together with a mason’s hoe. The greater sand content in the second base coat might generate less shrinkage to create a better base for the finish than the first base coat. must be properly detailed and constructed so that moisture is kept out of the wall because the system is not breathable. Where white or colored plaster mixes are used, they often are applied only as the finish coat. Stucco, however, is made from Portland cement, lime and sand. Premixed materials are color matched from batch to batch and are most consistent. Where the edges of paper-backed lath meet, connections should be lath-to-lath and paper-to-paper. That means that many materials are suitable for this application, but the common ones remain plywood, oriented strand board (OSB), cement board, and exterior grade gypsum sheathing. Is there a difference between the coats? The first two days are the most critical period. Over solid substrates—which include concrete masonry, cast-in-place concrete, and precast concrete—lath is sometimes used. There are two main standards organizations in North America, the American Society for Testing and Materials (ASTM) and the Canadian Standards Association (CSA). CEMIX CEMPLASTER displays a high level of workability and coverage; it resists sagging, cracking and shrinkage. (For general technical questions) Terry Willems Plaster Consultant, CTLGroup, Inc. (For investigation and testing), David Cook Plaster Consultant CTLGroup, Inc. (For investigation and testing), © 2019 Portland Cement Association. Products that increase the adhesion of plaster to substrate or plaster to plaster are called bonding agents, and are either surface applied to a substrate or integrally mixed into the plaster. Joint spacing in stucco is more of an issue over frame construction. Both consist of a binder, aggregates, and water. Difference Between Mortar & Plaster. Cement plaster has to be mixed with potable water only, in a clean plastic bucket or a clean non-corrosive, uncontaminated metal tub. 1) thickness of cement plaster :- recommended thickness of cement plaster is 6 mm (for ceiling and concrete plastering), 12 mm (for internal wall plastering and plane surface of brickwork) & 15 mm or 20 mm (for external wall plastering and rough surface of brickwork) are used in building construction. The following materials are candidate binders for stucco: Standards for all of these materials are available from ASTM. Applied directly to concrete masonry, portland cement plaster provides a tough ½-inch thick facing that is integrally bonded to the masonry substrate. Available in: 94lb. and thickness of the section. Applications that use metal lath require three layers of plaster: scratch, brown, and finish coats. It also corrodes metal framing and metal attachments. All rights reserved. Add the rest of the sand and water to a desired consistency and mix for no less than five full minutes. Is plaster the same as cement? For instance, the sand float finishes are described as light, medium, or heavy, and the grain size of aggregate helps achieve the desired texture. Additionally, the fact that you are placing a finish coat with a nominal thickness of 1/8 inch instead of a paint layer usually gives more assurance of complete coverage. These are direct-applied systems, meaning that there is no metal lath involved. Methods for achieving these criteria include sand blasting and high-pressure water blasting. Due to the nature of the product, it naturally looks minerally. Many homes built in the early 1900s have had very little maintenance and remain in good shape today. Following guidelines for curing and delay between coats usually result in the most consistent surface finish—uniform texture and color. A hydraulic cement is one that sets and hardens when mixed with water. The basecoat material acts like a glue to hold the backside, then also embeds the mesh that goes over the top of the shape. While Portland cement gave us the ability to create harder stuccos than lime and natural cements typically did, what we gained in strength, we lost in repairability. It is sometimes called “traditional stucco.” Stucco is a somewhat colloquial term for portland cement plaster, and some people consider it to refer to an exterior, not interior, finish. Since the addition of water to portland cement sets off a chemical reaction called hydration, it’s important to provide excess water to the cement particles so that they develop a good bond with their surrounding environment: aggregate and other cement particles. Cement. CEMIX CEMPLASTER can be used for plastering over lath wall, block work, brickwork and tilt slab substrates. In English "plaster"/Powder usually means a material used for the interiors of … It is made by adding our Color Dispersion Additive (CDA) to cement and sand. Over frame construction, lath must be used. A typical plaster mixture weighs about 142 pounds per cubic foot, roughly the same as mortar, and this amount of material would cover about 13.7 square feet at 7/8 inch thick. In addition, it may be beneficial to use a. Scratch coats are mixed at 1 part cement to 2-1/4 to 4 parts sand, brown coats are mixed at 1 part cement to 3 to 5 parts sand, and finish coats are 1 part cement to 1-1/2 to 3 parts sand. 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