An attic ladder is classified as a collapsible ladder. This type of ladder is specifically designed to be stored in a compact form when not in use, allowing it to be easily deployed into the attic space as needed.
Collapsible ladders are often equipped with mechanisms that allow them to fold down or collapse to minimize storage space, making them ideal for locations where space is limited, such as in attics. When deployed, these ladders can provide the necessary access to elevated areas, offering adequate support while allowing for safe ascent and descent.
In contrast, a fixed ladder is permanently installed and does not fold or collapse, while an extension ladder features sections that can be extended or retracted, but is not designed for compact storage in the same way. A folding ladder may also provide a degree of compactness, but it is generally more suited for different applications and does not specifically denote the attic context as clearly as a collapsible ladder does.