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Guide to Ladder Duty Ratings and Weight Capacities Understanding ladder duty ratings is essential for job site safety and OSHA compliance. At Dallas Ladder in Rowlett, TX, we help DFW contractors select the right rating for their needs. Duty Rating Breakdown Type I (Heavy Duty): 250 pounds for light industrial use.Type IA (Extra Heavy Duty): 300 pounds. Most popular for commercial construction.Type IAA (Extra Extra Heavy Duty): 375 pounds for heavy industrial and maximum safety. How to Choose A …