California Residential Inspector Practice Exam

What is the minimum bearing required for floor joists on masonry, concrete, or joist hangers?

1. 1 inch

2. 2 inches

3. 3 inches

4. 4 inches

The correct answer is: 3 inches

The correct answer reflects the minimum bearing requirement for floor joists, which is crucial for ensuring structural integrity and safety. A minimum bearing of 3 inches is mandated for floor joists resting on masonry or concrete, as well as for those using joist hangers. This requirement is established in building codes to ensure that the weight of the structure is adequately supported and distributed across a sufficient surface area. When joists are placed on masonry or concrete, the 3-inch bearing provides stability, helping to prevent issues such as movement, settling, and potential structural failure over time. This measurement is essential for ensuring that the joists have sufficient contact with their supporting members, which plays a critical role in maintaining the overall strength and durability of the floor system. In contrast, the other options of 1 inch, 2 inches, and 4 inches do not meet the minimum standards set by the building codes. A bearing of less than 3 inches can compromise the safety and performance of the floor assembly, while a requirement of 4 inches exceeds what is mandated, indicating that the correct minimum standard is indeed 3 inches. This understanding is vital for anyone involved in residential inspection and construction practices within California.