Which structural element must not be cut when installing gas piping or ductwork?

When installing gas piping or ductwork, trusses must not be cut because they serve a critical structural function in supporting the load of the building. Trusses are engineered to distribute loads across a larger area, providing stability and integrity to the roof and upper levels of a structure. Cutting through a truss could significantly compromise the structural integrity, leading to potential safety hazards such as sagging or even collapse.

While beams, studs, and joists also serve important structural roles, cutting them may sometimes be permissible under specific conditions if proper engineering assessments and reinforcement strategies are employed. However, guidelines typically emphasize that trusses, due to their complex designs and load distribution capabilities, should remain intact during any modifications to ensure the overall safety and stability of the building.