Stucco
Traditional stucco is a cement-based plaster (a mixture of Portland cement, lime, sand, and water) applied in three coats. Synthetic stucco, used in exterior insulation finish systems (EIFS), replaces the cement and lime found in traditional stucco with a polymer base. It is typically applied in two coats, with a thin fiberglass mesh embedded in the base coat. Hybrids of these two systems include traditional stucco with polymer additives and synthetic topcoats added over thick, traditional base coats. Due to the integral color in stucco's topcoat, painting is unnecessary. Stucco may be painted, but once it has been painted, that coating needs to be maintained to remain attractive. Stucco is long lasting and has low maintenance requirements. Moisture can be a problem with stucco, especially with synthetic stucco, which is less moisture-permeable than traditional stucco. Adequate flashing and drainage detailing are essential to the durability in any stucco wall finishing system.