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Guide to Ladder Duty Ratings and Weight Capacities Every ladder carries a duty rating stamped on the side, and most crews read it as a rough guide to how heavy the ladder is rather than what it will hold. That rating is the load the ladder is designed to carry - the person plus everything on them - and getting it wrong is one of the most commonly cited ladder problems on a job site. The Three Ratings You Will Actually See Type I is the lightest of the commercial ratings at 250 pounds, and it is …