Every ladder has a specific purpose. Portable ladders are usually built from aluminum, fiberglass, or wood and are classified in the following categories:
Type 1 250 lb Capacity Fiberglass Stepladder
Extension – Commonly used for those areas where height is involved and always requires a spotter.
Stepladder – The most common around the house has spreaders that lock, a front with steps and a rear that is not built for climbing.
Straight – Should have an anti-slip safety shoe. Leaned against surfaces for use and requires a spotter.
Trestle – Has a trestle ladder base and a single vertical adjusting ladder which may be interlocked self-supporting and adjustable in length.
Twin front – Similar to the stepladder except there are steps on both sides for use with an assistant.
Ladders consist of a duty rating with five types:
Type IAA – Rated for extra heavy duty use with a load capacity of 375 pounds.
Type IA – Rated for extra heavy duty use with a load capacity of 300 pounds.
Type I – Rated for heavy duty use with a load capacity of 250 pounds.
Type II – Rated for medium duty use with a load capacity of 225 pounds.
Type III – Rated for light duty use with a load capacity of 200 pounds.
