There are numerous other ASTM International standards for portland cement-based plaster and stucco. It does not define a unit of work or assign responsibility for contractual purposes. Standard practices and specifications for the materials in or in contact with plaster and stucco, as well as those for their application, can help assure the strength and reliability that is inherent with the inclusion of portland cement.įor example, ASTM C926-22c: Standard Specification for Application of Portland Cement-Based Plaster covers guidelines for the application of full thickness portland cement-based plaster or stucco for exterior and interior work. Both need water in order to mix everything together and activate the curing process. Both are made with an aggregate of some kind, usually sand of various sizes and textures. Standards for Plaster and Stucco Containing Portland Cement Plaster vs Stucco Like I just mentioned, the ingredients are what make the difference in these two similar building materials. Both consist of a binder, aggregates, and water. The details that follow are standard details that depict proper detailing for cold-formed steel framed exterior walls with a conventional stucco finish. Instead, in English, plaster broadly is thought of being used entirely for interior use and stucco for exterior applications. gypsum or cement), this may not be wholly accurate. While some may classify stucco or plaster as utilizing separate binding materials (e.g. It is, however, important to recognize the difference between stucco and plaster. Today, while plaster comes in various types, portland cement has been responsible for granting substantial strength to the plasters that contain it. The WCC makes no warranty or guarantee, expressed or implied about. Stucco faced a monumental change in 1824, with the discovery of cement.įor stucco and plaster, the ancient Greeks and Romans utilized a volcanic ash mixture. This document is a guideline and is not intended for any specific construction project. Many ancient and historical examples of stucco have persisted until today-a structural accomplishment considering that these relics precede modern innovations. Plaster and stucco can both be applied much the same way, with the same textures and thicknesses, but the main ingredients in each are what make them different animals. Their differences are not readily apparent to the naked eye. While they are similar in a lot of ways, they are different enough that understanding when and where to use them, especially in renovations, is imperative. In fact, the peculiar word “stucco” derives from 1590s Italian, and it may even have deeper Proto-Germanic roots. A lot of folks confuse plaster and stucco in old houses. A contemporary marvel, stucco actually dates back to ancient times. Today, stucco is valued for masonry, as the plaster allows for complex aesthetic details in buildings and structures. Numerous ASTM International standards detail the specifications for portland cement-based plaster and stucco.
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