Brown Coat

Definition

The brown coat is the second of three coats in a plaster or stucco application.

Purpose

The brown coat serves as a leveling layer, providing a flat, even surface for the final coat. It is applied over the scratch coat and ensures that the final coat adheres properly and achieves the desired smoothness and finish. This coat is critical for the durability and appearance of the plaster or stucco finish.

Examples of Use

1. Interior Plaster Walls: The brown coat is applied as the second layer in traditional three-coat plaster systems to create a smooth, durable base for the finish coat.
2. Stucco Exteriors: In exterior stucco applications, the brown coat is used to level the surface before the application of the final decorative layer.
3. Restoration Projects: The brown coat is essential in the restoration of historic buildings, where traditional plastering techniques are replicated.

Related Terms

• Scratch Coat: The first layer in plaster or stucco applications, which is scored to provide a key for the brown coat.
• Finish Coat: The final layer applied over the brown coat, providing the desired texture and appearance.
• Lath: A supporting framework of wood or metal used as a base for the plaster or stucco.

Notes

Proper curing of the brown coat is crucial to prevent cracking and ensure a strong bond with the finish coat. The thickness and composition of the brown coat should be consistent with the overall plaster or stucco system specifications.