Construction Supervisor License Practice Exam

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At what minimum angle from the horizontal must let-in wall bracing be installed in a single-family dwelling?

A. 60
B. 30
C. 15
D. 45

The correct answer is: D. 45

Let-in wall bracing is a method used to provide lateral support to walls in a structure, particularly in single-family dwellings. The minimum angle at which let-in bracing should be installed is crucial for ensuring that the bracing provides the necessary strength and stability to resist forces such as wind or seismic activity. When installed at a minimum angle of 45 degrees from the horizontal, the bracing allows for optimal transfer of loads, ensuring that the wall remains rigid and does not sway or collapse under lateral pressures. This angle strikes a balance between providing adequate structural support and facilitating ease of installation. Braces installed at less than 45 degrees, such as 30 or 15 degrees, may not effectively distribute the forces acting on the wall, leading to potential weaknesses. Therefore, adhering to the 45-degree angle standard helps ensure that the bracing performs efficiently, maintaining the safety and integrity of the structure.