Residential Building Inspector Practice Exam

What is the minimum nominal wall thickness for a masonry foundation?

1. 16 inches

2. Table R404.1.1(1)

3. 12 inches

4. 8 inches

The correct answer is: Table R404.1.1(1)

The minimum nominal wall thickness for a masonry foundation is determined by specific building codes that provide guidelines for structural integrity and safety. The reference to Table R404.1.1(1) indicates that it is a standard in the building codes, typically found in the International Residential Code (IRC). This table outlines requirements based on various factors, such as height and load considerations. Using a standard reference like Table R404.1.1(1) ensures that inspectors and builders adhere to proven guidelines that take into account both regional conditions and structural performance. This table helps to ensure that all masonry foundations meet the necessary standards for stability and durability, adapting to different loads and environmental factors. In contrast, the specific thickness options listed (16 inches, 12 inches, and 8 inches) do not represent universally applicable standards, as the required thickness can vary based on material type, wall height, and other design parameters laid out in the building codes. By referencing the table, one ensures compliance with prevailing safety standards and engineering principles.