Under what condition may a truss be notched or grooved?

A truss may be notched or grooved when it has been preapproved in writing by a certified engineer. This condition ensures that any alterations to the truss, which is a crucial component in structural frameworks, are assessed for their impact on structural integrity and safety. Engineers have the expertise to evaluate the consequences of such modifications and ensure that they comply with necessary building codes and standards. Their written approval serves as an official record that the changes are acceptable and that the structure will remain safe and functional after alterations are made.

Other conditions, such as verbal approvals, general practices that do not impact integrity, or notations in building plans, may not hold the same weight as engineered approval, as they might lack a thorough evaluation of the structural implications. Hence, obtaining written consent from a certified engineer is the most responsible and compliant approach for any alterations to trusses.