What is the typical sequence for a three-coat exterior stucco system?

• A. Finish coat, brown coat, base coat
• B. Base coat, finish coat, brown coat
• C. Base coat, second coat (brown coat), finish coat
• D. Brown coat, base coat, finish coat

Answer: (C)

In a traditional three-coat exterior stucco system, the layers are applied in a specific order to build up strength and provide a proper key for the next layer. The first layer is the base coat, which adheres directly to the lath or substrate and creates a solid foundation with a good key for bonding. The second layer, the brown coat, adds most of the system’s thickness and strength, leveling the surface and preparing a smooth, uniform substrate for the final layer. The last layer is the finish coat, a thin, decorative layer that provides the color, texture, and weather-resistant surface.

So the correct sequence is base coat, second coat (brown coat), finish coat. The finish coat sits on top of the thicker, bonding layers and is designed to handle surface appearance and protection, while the base and brown coats supply the structural integrity and adhesion.