Design Guide 40 Rain Loads and Ponding


AISC Members can download the PDF for free from the AISC website.

SKU: DG40-2024 Category:


The American Institute of Steel Construction and the Steel Joist Institute have teamed up to create the new Design Guide 40 Rain Loads and Ponding. The Design Guide is based on the ASCE/SEI 7-22, the 2022 edition of the AISC Specification for Structural Steel Buildings, and the 2020 edition of the SJI Standard Specifications for K-Series, LH-Series, and DLH-Series Open Web Steel Joists, and for Joist Girders. 

This Design Guide provides an in-depth review of rain loads and ponding effects to help design professionals properly and efficiently design for ponding on roofs constructed with structural steel, open web steel joists, and joist girders. It includes 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. These methods are thoroughly discussed and then demonstrated with many helpful design examples.

Chapters include:

  • Recommended Method of Design for Ponding
  • Methods of Analysis for Ponding
  • SJI Roof Bay Analysis Tool
  • Design Examples

Published First Edition April 2024

Note: This replaces SJI’s Technical Digest 3 Structural Design of Steel Joist Roofs to Resist Ponding Loads.

Related Resources

Additional information

Dimensions N/A
Publication type

Download, Hard copy