We are sure we have said this before, but we cannot say it enough: many questions about the application of building code provisions can be answered simply by looking at the Definitions section of the code. Below is one such question we received recently.

Q. I was hoping you could lend some insight into a code interpretation issue we have. We are designing a self-supported, trussed scoreboard structure. This structure is supported by four vertical trusses, the two center ones of which form a vertical box truss. The scoreboard cantilevers past each of the end vertical trusses. The structure is fully clad, and measures 110′ wide x 80′ tall x 8′ deep.

It is our interpretation that the wind design provisions for solid freestanding signs of ASCE7-10 Chapter 29 would be the appropriate method in determining the wind pressures for such a structure. However, another firm has contended that the structure should be designed for wind pressures based on the structure being an enclosed building. Needless to say, the pressures caused by Case B and Case C wind load cases are creating a significant differential in the two lines of thinking. Which one do you think is the correct way to design the sign structure?

A. To answer the question, let’s look at the definition of BUILDINGS in ASCE 7-10 Section 1.2.1. It reads:

Structures, usually enclosed by walls and a roof, constructed to provide support or shelter for an intended occupancy.

Since your clad structure is NOT providing “support or shelter for an intended occupancy,” it is not considered a building by current codes. Thus, we agree with your approach to the design. ASCE 7-10 Chapter 29 is, in our opinion, the right chapter to apply.