Stucco vs plaster vs7/3/2023 ![]() The systems may share similarities in application techniques or final appearance, but the systems perform differently in resisting weather, especially wet conditions. There have been fewer problems with EIFS used over solid bases such as concrete or masonry because these substrates are very stable and are not subject to rot or corrosion.Ĭlearly, portland cement stucco should not be confused with the exterior insulation and finish systems. It also corrodes metal framing and metal attachments. Trapped moisture eventually rots insulation, sheathing, and wood framing. While the polymer based skin repels water very effectively, problems arise when moisture gets behind the skin-typically via window, door, or other penetrations-and is trapped inside the wall. The basecoat for polymer based systems is usually 1/16-inch thick and finish coat thickness is typically no thicker than the maximum sand particle size in the finish coat.Įxterior insulation finishing systems experienced performance problems in the mid 1990s, including water leakage and low impact resistance. Polymer based (PB) systems, sometimes known as thin coat, soft coat, or flexible finishes, are the most common. It’s a proven system that works in all climates.Įxterior insulation finishing systems (EIFS) consist of a polymer-based laminate that is wet applied, usually in two coats, to rigid insulation board that is fastened to the wall with adhesive, mechanical fasteners, or both. Portland cement plaster has high impact resistance and sheds water, but breathes, allowing water vapor to escape. ![]() A vapor permeable, water-resistant building paper separates the plaster and lath from water-sensitive sheathing or framing. When applied to metal lath, three coats of plaster form a 7/8-inch total thickness. Applied directly to concrete masonry, portland cement plaster provides a tough ½-inch thick facing that is integrally bonded to the masonry substrate. It is similar to limewash as it is a lime-based putty made from fired limestone or marble dust mixed with water, but it’s thicker and the finish can range from shiny to matte with a marbled appearance. It may be applied directly to a solid base such as masonry or concrete walls, or it can be applied to metal lath attached to frame construction, solid masonry, or concrete construction. Venetian Plaster, also known as Polished Plaster, is one of the oldest building materials known to man. Portland cement plaster is applied either by hand or machine to exterior and interior wall surfaces in two or three coats. To complicate matters, “plastering” is the verb that describes the action of applying any of these various materials to a wall surface. Exterior insulation and finish system (EIFS) is sometimes (incorrectly) called “synthetic” stucco. It is sometimes called “traditional stucco.” Stucco is a somewhat colloquial term for portland cement plaster, and most people in the construction industry consider it to refer to an exterior, not interior, finish. ![]() Portland cement-based plaster is such a material that uses portland cement as the binder. Plaster is the general term for material that is applied to a wall surface in a thin layer. The answer requires a bit of an explanation. ![]()
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