Which type of ladder is designed to be used as a self-supporting stepladder and as a single or extension ladder?

• A. Roof ladder
• B. Straight ladder
• C. Extension ladder
• D. Combination ladder

Answer: (D)

A ladder that can stand on its own as a stepladder and also be set up as a single or extension ladder is designed for versatility through adjustable, hinged sections. This combination design lets you open it up into an A-frame for stable, free-standing use at moderate heights, then reconfigure or extend the same pieces into a straight ladder for greater reach when you need it. That dual capability is what makes it the best fit for both self-supporting use and extended height tasks.

Other ladders are more limited in how they’re used. A straight ladder is meant to lean against a surface and isn’t self-supporting in working height. An extension ladder is designed to lean and extend for height, not to stand on its own as a stepladder. A roof ladder is specialized for roof work and not intended to function as a free-standing stepladder. The combination ladder combines the features of a stepladder and an extension/leaning ladder in one unit.