Image courtesy American Institute of Steel Construction (AISC)
The American Institute of Steel Construction (AISC) and Steel Joist Institute (SJI) published a comprehensive reference volume for rain loads and ponding design, Design Guide 40, Rain Loads and Ponding. The guide provides guidance for the design of roof systems to avoid or resist water accumulation and any resulting instability. It includes an in-depth review of rain loads and ponding effects to help design professionals design for ponding on roofs constructed with structural steel, open web steel joists, and joist girders.
It also contains several recommended methods of analysis that can be used to consider the effects of ponding, methods of design accounting for ponding effects, and a presentation of the SJI Roof Bay Analysis Tool, along with design examples that illustrate concepts.
Mark Denavit, PE, Ph.D., associate professor at University of Tennessee, Knoxville, and James Fisher, PE, Ph.D., emeritus vice president at CSD Structural Engineers, Milwaukee, wrote the guide.
