What is a ladder I-beam usually made of?

A ladder I-beam is typically made of fiberglass. This choice is correct because fiberglass combines strength with lightweight properties, making it ideal for use in emergency situations where weight and durability are critical. Fiberglass also has the added benefit of being non-conductive, which enhances safety when firefighters are operating in environments where they might encounter electrical hazards.

While wood is a traditional material for ladders, it can be heavier and less durable compared to fiberglass. Truss blocks are not standard components in ladder construction, and alloys, though strong, may not have the same non-conductive properties that fiberglass provides. Therefore, fiberglass stands out as the preferred material for making ladder I-beams due to its unique properties that cater specifically to the needs of firefighters.