Question

If the allowable deflection for the truss is L/400, where L is the clear span, does your truss need to be re-designed?

Answer 1

Solution:

Your truss need not to be re-designed, if the allowable deflection for the truss is L/400, where L is the clear span.

Explanation-

Generally, for roof trusses, the deflection in inches cannot exceed   and due to total load . And for floor trusses, the deflection due to live load cannot exceed and due to total load .

In this case, the allowable deflection for the truss is L/400, which will give less value then the above criteria. So the design of truss is safe.