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A structural design professional must approve which of the following regarding trusses?

  1. Type of wood to be used

  2. Alterations to the trusses

  3. Design layout of the structural frame

  4. Fastening method

The correct answer is: Alterations to the trusses

The statement regarding the need for a structural design professional's approval of alterations to the trusses is grounded in safety and structural integrity considerations. Trusses are critical components that bear loads and contribute to the stability of a structure. Any modifications can significantly impact their performance, load distribution, and overall safety. Approving alterations ensures that the changes comply with established engineering principles and building codes, which are designed to safeguard the structural integrity of the building. By requiring approval, it promotes the involvement of professionals trained in understanding the implications of such alterations, thereby mitigating risks associated with possible structural failure. The other aspects, such as the type of wood used, the design layout of the structural frame, and the fastening method, while important, generally fall within predetermined specifications and guidelines established by the building codes or the original design. These factors are typically determined and documented during the initial design phase, and do not typically require subsequent approval unless significant changes to the structure occur.