Metal Buildings
Wind and snow load ratings determine whether your metal building can withstand local weather conditions. Learn about certification, wind zones, and building codes.
What Are Wind and Snow Load Ratings? Wind load and snow load ratings are engineering measurements that define how much force from wind pressure and snow weight a building is designed to withstand. These ratings are expressed in specific units — wind load in miles per hour (mph) or pounds per square foot (psf), and snow load in pounds per square foot (psf) of ground snow. A building's load ratings are determined by its engineering design: the gauge and spacing of the frame members, the connections between components, the roof style, the panel thickness, and the anchoring method. When a building is certified to meet specific load ratings, a licensed professional engineer has reviewed the design and stamped drawings confirming that the structure meets those performance standards. Why Load Ratings Matter Load ratings are not just technical specifications — they have real-world implications for your building's safety, legality, and insurance. A building that is not rated for your area's wind and snow conditions may fail during severe weather, potentially causing property damage, injury, or worse. From a regulatory perspective, most jurisdictions require building permits for metal…