Massachusetts Unrestricted Construction Supervisor License Practice Test

What is the maximum allowed cantilever span for a 2x8 floor joist supporting an exterior balcony?

1. 30 inches

2. 34 inches

3. 36 inches

4. 42 inches

The correct answer is: 34 inches

The correct maximum allowed cantilever span for a 2x8 floor joist supporting an exterior balcony is 34 inches. This measurement is based on building codes and standards that govern structural integrity and safety. Cantilevers experience increased bending moments due to their unsupported ends, which necessitates specific guidelines to ensure they can safely support the intended loads. When determining the maximum cantilever span, factors such as material strength, joist dimensions, and the type of load are taken into account. A 2x8 floor joist, commonly made from wood, has a defined safe load capacity when cantilevered. In this context, the 34-inch span adheres to the recommended guidelines that balance structural capability with safety requirements for balconies, which can experience considerable live loads. Understanding the maximum dimensions for cantilevers is crucial for effective design and construction practices, ensuring the longevity and stability of balcony structures while complying with regulations.