Minimum Design Loads and Associated Criteria for Buildings and Other Structures (ASCE 7-22) and the International Building Code (IBC 2024) provide detailed procedures for determining the loads and load cases required for the safe design of steel buildings, including pre-engineered metal buildings (PEMBs). In addition, the Metal Building Systems Manual (2024 Edition) provides practical guidance and solved examples based on these standards. Together, these codes and manuals account for various structural behaviors, load distributions, and critical scenarios that may govern the design of both primary and secondary members.


In practice, however, some of these requirements are frequently simplified or overlooked during the design process. This often occurs because evaluating all load cases, load patterns, and localized effects can be computationally demanding and time-consuming. Although such simplifications or omissions may reduce calculation effort, they can also lead to significant underestimation or overestimation of structural demand. In many cases, this results in designs that are either unsafe and noncompliant with code provisions or unnecessarily conservative and uneconomical.


The following sections highlight several commonly neglected requirements in the structural design of PEMBs, including snow loading patterns, snow drift effects, wind loading for components and cladding, internal pressure cases, roof live load reductions, and roof live load considerations for photovoltaic systems.