North Carolina Building Contractor License Practice Exam

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What is the required thickness range for a mortar bed on top of a footing?

6 to 10 inches
8 to 12 inches
12 to 18 inches
12 to 24 inches

The correct answer is: 12 to 18 inches

The required thickness range for a mortar bed on top of a footing is generally set to ensure structural integrity and support for the load above. A range of 12 to 18 inches is appropriate as it allows for adequate strength to distribute weight from the masonry units that will be placed on top, preventing cracking or settlement over time. This specific range also facilitates proper bonding and curing of the mortar, essential for creating a solid base that adheres well to both the footing and the masonry above. The thickness needs to strike a balance, being thick enough to provide stability while not being excessively so, which could lead to unnecessary material costs or potential issues related to excess weight. Additionally, various building codes and standards may guide these thickness requirements. Factors such as the type of structure, local building codes, and specific design conditions will also influence the exact thickness chosen within this range, making it a practical choice for most applications.