Without approval from a registered design professional, which modifications can be made to wood floor trusses?

When working with wood floor trusses, it's crucial to follow specific guidelines to ensure structural integrity and safety. Modifications such as cutting, splicing, or notching wood floor trusses generally require approval from a registered design professional. This is because any alteration can significantly affect the load-bearing capacity and performance of the truss system.

By not having the necessary approval for modifications, such as cutting or notching, you risk compromising the designed structural performance of the trusses. These components are engineered to distribute loads in a particular manner, and unauthorized modifications can lead to unexpected failure, reduced load capacity, or even catastrophic collapse.

Thus, the correct choice reflects the necessity of maintaining the original design of wood floor trusses without the oversight of professionals who can ensure that any changes do not adversely impact the structure's safety or compliance with building codes.