North Carolina Building Contractor License Practice Exam

What is the minimum overall thickness of stucco, including lath, over concrete or masonry surfaces?

1. 1/2 inch

2. 3/4 inch

3. 1 inch

4. 12 inches

The correct answer is: 12 inches

The minimum overall thickness of stucco, including lath, over concrete or masonry surfaces is established to ensure structural integrity and proper application. The correct answer, which identifies this minimum thickness, indicates that the lath and stucco combined must meet specific standards for durability, adherence, and weather resistance. Typically, stucco systems are designed to provide adequate coverage and support, and the thickness is essential in achieving the desired finish and performance of the stucco. Ensuring that the stucco is suitably thick helps prevent issues like cracking or water infiltration, which can compromise the building's envelope. The other options suggest insufficient thickness for proper applications; a minimum thickness of 1/2 inch or 3/4 inch may not provide the necessary strength and protection, while suggesting a thickness of 12 inches greatly exceeds the typical requirements, thus making it impractical and unnecessary for standard stucco applications.