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What is the total thickness requirement for the first two coats of exterior plaster?

  1. 1/2"

  2. 3/4"

  3. 1"

  4. 1 1/4"

The correct answer is: 3/4"

The total thickness requirement for the first two coats of exterior plaster is 3/4 inches. This standard thickness is important for ensuring structural integrity, moisture resistance, and durability of the plaster finish. The basecoat of plaster is typically applied at a thickness of approximately 1/2 inch, providing a solid foundation for the finish coat. The finish coat, which generally follows, adds another 1/4 inch, bringing the total thickness to 3/4 inch. Achieving this specific thickness is essential for proper adhesion and performance of the plaster, as it allows for adequate bulking and prevents cracking or delamination over time. In contrast, thicker options such as 1 inch or 1 1/4 inches may exceed typical requirements, potentially leading to unnecessary weight and stress on the substrate, which could foster issues with the plaster's long-term stability. Therefore, maintaining the specified thickness contributes to the overall effectiveness and longevity of the plaster system.