Ladder duty ratings give the maximum load the ladder is rated for, including you, your clothes, tools and materials. Type IAA is rated for 375 pounds, Type IA for 300, Type I for 250, Type II for 225 and Type III for 200. Jobsite work generally calls for Type IA or IAA. Use fiberglass near electricity, set extension ladders at a 4-to-1 angle and extend them at least 3 feet above the landing.
Ladder falls are among the most common construction injuries. The right rating and setup prevent most of them.
Duty ratings
| Type | Rated load | Typical use |
|---|---|---|
| IAA | 375 lb | Special duty, heavy trades |
| IA | 300 lb | Extra heavy duty, professional |
| I | 250 lb | Heavy duty, industrial |
| II | 225 lb | Medium duty, commercial |
| III | 200 lb | Light duty, household |
The rated load includes the user, clothing, equipment and materials.
Materials
| Fiberglass | Aluminum | Wood | |
|---|---|---|---|
| Electrical | Non-conductive when clean and dry | Conducts | Varies, avoid near power |
| Weight | Heavier | Light | Heavy |
| Durability | Weather-resistant | Dents | Needs care |
Ladder types
- Step ladders: never stand on the top cap or top step.
- Extension ladders: for reaching roofs and upper levels.
- Multi-position ladders: convert between step, extension and scaffold.
- Podium and platform ladders: large standing area, often with guardrails.
Setup
- Inspect rungs, rails, feet and locks before each use.
- Set extension ladders at a 4-to-1 angle.
- Extend at least 3 feet above the landing.
- Keep three points of contact while climbing.
- Do not carry loads that could make you lose your balance.
For larger work areas, see scaffolding and platforms. Wear a hard hat and safety boots.
Browse ladders and scaffolding.
Common questions
What ladder duty rating do I need?
Add your body weight, clothing, tools and materials. Most construction work needs Type IA (300 lb) or Type IAA (375 lb).
Why use a fiberglass ladder?
Fiberglass rails do not conduct electricity when clean and dry, so they are the choice for electrical work and anywhere near power lines.
What is the 4-to-1 rule?
For every 4 feet of height to the support point, the base of an extension ladder should be 1 foot out from the wall.
How far should a ladder extend above a roof?
At least 3 feet above the landing surface when used to access an upper level, under OSHA construction rules.