It also corrodes metal framing and metal attachments. Trapped moisture eventually rots insulation, sheathing, and wood framing.
#Stucco vs plaster vs skin
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 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 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. 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 is sometimes (incorrectly) called “synthetic” stucco. 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. 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 thorough explanation. We are often asked if stucco and plaster are the same thing, and if plaster and exterior insulation finishing systems (EIFS) are the same thing. While there are several parts of the North America where stucco always has a strong presence, there appears to be a general renewed interest in portland cement plaster for building finishes everywhere.
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