Florida Building Code Practice Exam

Built-up girders and beams should be fastened using which of the following?

1. 16d common nail at 20" o.c., at top and bottom

2. 20d common nail at 36" o.c., at top and bottom

3. 16d common nail at 32" o.c., at top and bottom

4. 20d common nail at 32" o.c., at top and bottom

The correct answer is: 20d common nail at 32" o.c., at top and bottom

The use of 20d common nails at 32 inches on center for fastening built-up girders and beams is correct because it aligns with the requirements for structural integrity and load capacity specified in the Florida Building Code. Built-up beams and girders need adequate fastening to ensure they can support the loads they are designed for without compromising safety or performance. In particular, the 20d common nail provides greater strength and holding power compared to smaller size nails, making it a suitable choice for heavy structural components like girders and beams. The spacing of 32 inches on center is also appropriate to maintain adequate support while preventing potential deflection or failure of the beam under load. Considering these factors, the selection of this specific fastening method ensures the built-up girders and beams are securely joined and capable of performing effectively in construction applications, conforming to best practices in structural engineering and building codes.