What criterion must be met for alterations to trusses, including cuts, notches, and holes?

For alterations to trusses, such as making cuts, notches, or holes, it is essential to obtain written concurrence and approval. This requirement exists because trusses are critical structural components that are specifically designed to carry loads in a precise manner. Any modifications can significantly impact their load-bearing capacity and overall structural integrity.

Securing written approval ensures that the modifications are evaluated by a qualified professional, such as a structural engineer, who can assess the safety implications and verify that the truss will continue to meet the necessary codes and standards after alterations are made. This process leads to better safety practices and mitigates the risk of structural failure, which could have severe consequences.

Other options do not provide the same level of assurance. For instance, local building code approval might be necessary, but it is not sufficient on its own without the explicit consultation of a structural expert on the modifications. Informal approval from a contractor may lack the rigor and documentation needed to ensure safety, while assuming that no approval is necessary poses significant risks to both safety and compliance with applicable codes.