Extention Ladders (non-self-supporting)

Extention Ladders offer the greatest length in a general purpose ladder. The ladder consists of two or more sectionsthat travel in guides or brackets, allowing adjustablelengths. The sections must be assembled so that the sliding upper section is on top of the lower section. Each section must overlap its adjacent section a minimumdistance, based on the ladder’s overall length. The overall length is determined by the lengths of the individual sections, measured along the side rails. The table below shows the minimum overlap for two-section ladders up to 60 feet long.

Most Extention Ladders are made of wood, aluminum, or reinforced fiberglass. Wood ladders can’t have more than two sections and must not exceed 60 feet. Aluminum and fiberglass ladders can have as many as three sections; however, the overall length must not exceed 72 feet. Individual sections of any Extention Ladders must not be longer than 30 feet. Extention Ladders can be used only by one person at a time.

➤ Is it necessary to “tie off” an Extention Ladders to prevent it from slipping? You don’t have to tie off the ladder but you do have to ensure that the ladder cannot be accidentally moved or displaced. Tying off the top or bottom of a ladder is one way to ensure that it cannot be accidentally moved or displaced.

Ladder from wikipedia

A ladder is a vertical or inclined set of rungs or steps. There are two types: rigid ladders that can be leaned against a vertical surface such as a wall, and rope ladders that are hung from the top. The vertical members of a rigid ladder are called stringers (US) or stiles (UK). Rigid ladders are usually portable, but some types are permanently fixed to buildings.