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Exterior Insulation and Finish Systems (EIFS), also called synthetic stucco, are available in drainable or barrier systems that resemble traditional masonry stucco finishes. EIF systems are aesthetically attractive to many people due to the variety of colors and textures available, and special architectural features that are easily created. While among the more expensive finishing systems available, drainable EIFS, if properly applied, may benefit the homeowner by providing an insulating exterior finish without the worries about water damage associated with barrier EIFS. Drainable systems may prevent water accumulation problems that sometimes occur with barrier or face-sealed EIF systems. A barrier EIFS resists water penetration at its outer surface but does not allow water that gets behind the exterior surface to drain out of the wall system. Drainable EIF systems consist of an extruded (XPS) or expanded polystyrene (EPS) or a polyisocyanurate foam glass fiberboard. An installer applies them with special mechanical fasteners or adhesives to a metal, plastic, or glass fiber mesh, creating a drainage plane. Alternatively, a grooved foam board can allow drainage. The mesh covers a weather-resistive barrier such as building paper or house wrap, which in turn covers the sheathing or substrate. OSB, plywood, and exterior-grade gypsum sheathing are the most common substrates. A base coat of a cement/polymer mixture covers the insulation board and provides a base for embedding a fiberglass mesh. A flexible, acrylic-modified finish coat in the desired color and texture is applied over the base coat. Application of a special sealant and flashing are also required to provide water-tight seals and to divert water from critical junctions between EIFS and building components