Stucco Plaster – Names of the three coats in conventional three-coat work In traditional three-coat stucco plastering, what are the standard names of the first, second, and third coats applied in sequence?

Introduction / Context:
Stucco plastering traditionally uses three layers to achieve durability, flatness, and finish quality. Each coat has a specific purpose and composition, and knowing their names is essential for specifications, inspections, and payment items in contracts.

Given Data / Assumptions:

• Three-coat work over lath or masonry background.
• Standard lime–cement–sand mixes with appropriate curing.
• Coat thicknesses and timing follow trade practice.

Concept / Approach:

The scratch coat establishes a rough, keyed base and levels major irregularities; it is scratched to promote mechanical bond. The brown coat builds body and corrects plane, providing a smooth, plumb substrate. The white (finish) coat develops the final appearance and surface hardness, often with finer aggregates or neat materials. Correct curing between coats controls shrinkage cracking.

Step-by-Step Solution:

Verification / Alternative check:

Trade manuals and codes list the same nomenclature, with recommended thicknesses such as roughly 10–12 mm scratch, 6–8 mm brown, and 3–4 mm finish, depending on system.

Why Other Options Are Wrong:

“None” contradicts established practice; single statements omit the complete sequence.

Common Pitfalls:

Applying coats too quickly without adequate set/cure; omitting scratches; finishing over a still-green brown coat leading to crazing.

Final Answer:

All of the above