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Load Limits on Scaffold Boards in Medium Duty Applications OHSA designates three different categories for load bearing calculations on scaffold boards. They are:Light Duty - 25 pounds per square foot.Medium Duty - 50 pounds per square foot.Heavy Duty - 75 pounds per square foot. How Load Limits Are Calculated for Scaffolding These ratings are based on the intended load, which is calculated by dividing the total weight to be placed between two spans of scaffolding by the total area between the …