Ladder Duty ratings were created to establish consistent standards for the construction, design, testing, care, and use of portable ladders of various types and styles.
There are different styles of ladders, such as portable stepladders, step stools, extension ladders, trestle ladders, sectional ladders, combination ladders, single ladders, platform ladders, and articulating ladders.
Each duty rating is associated with a corresponding maximum weight capacity that the ladder can safely support. The maximum weight or load is determined by several factors:
- Your weight, plus
- Weight of PPEs you’re wearing, plus
- Weight of tools and tackles stored on the ladder pocket
To meet safety standards, all ladders are required to have a Duty Rating sticker placed on the side. It’s important to note that the ladder’s weight capacity is not related to its length, so it is not safe to assume that a longer ladder has a higher weight capacity.
Ladder Duty Ratings Explained
Ladder Duty Ratings are categorized into five different classes.
Type l
The Type I ladder is a popular choice among professionals such as contractors, construction workers, and public utilities. It is available in various materials and lengths, ranging from 3 to 20 feet. The rating for Type 1 ladders is divided into three subcategories.
- Step ladders of type 1 are designed to support a maximum weight of 250 lbs.
- Type1A step ladders are designed to support a maximum of 300 lbs of weight.
- Type 1AA step ladders can support a maximum of 375 lbs of weight.
Type II
Type 11 ladders are available in lengths ranging from 3 to 20 feet. They are primarily used in commercial settings by painters, interior decorators, maintenance workers, and electricians. These ladders can support a maximum weight of 225 lbs. On the other hand, Type II ladders are designed for medium-duty use and can be made of wood, fiberglass, or aluminum.
Type III
Type III ladders are commonly used for light household work, with a load capacity of 200 lbs. They are available in lengths ranging from 3 to 6 feet.
Here’s a brief summary of the duty ratings and load capacities
| Type III (Light Duty) | 200 pounds |
| Type II (Medium Duty) | 225 pounds |
| Type l (Heavy Duty) | 250 pounds |
| Type lA (Extra Heavy Duty) | 300 pounds |
| Type lAA (Extra Heavy Duty) | 375 pounds |