Florida Building Code Practice Exam 2025 - Free Building Code Practice Questions and Study Guide

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.