6,8,10,12 and 14 ft heavy duty step ladders available.
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. They are commonly made of metal or fiberglass, but they have been known to be made of tough plastic.
Rigid ladders are available in many forms, such as:
- Bridge ladder, a ladder laid horizontally to act as passage between two points separated by a drop.
- Cat ladder (US chicken ladder), a lightweight ladder frame used on steep roofs to prevent workers from sliding
- Extension ladder or “Telescopic ladder”, a fixed ladder divided into two or more lengths for more convenient storage; the lengths can be slid together for storage or slid apart to maximize the length of the ladder; a pulley system may be fitted so that the ladder can be easily extended by an operator on the ground then locked in place using the dogs and pawls
- Fixed ladder, two side members joined by several rungs; affixed to structure with no moving parts
- Folding ladder, a ladder in the step ladder style with one or more (usually no more than three) one-way hinges. Ideal for use on uneven ground (i.e. stairs), as a trestle or when fully extended a Fixed ladder. Some variations feature a central one-way hinge with extensible locking legs
- Hook ladder or pompier ladder, a rigid ladder with a hook at the top to grip a windowsill; used by firefighters
- Orchard ladder, a three legged step ladder with third leg made so that it can be inserted between tree branches for fruit picking
- Platform steps, a step ladder with small horizontal platform at the top
- Roof ladder, a rigid ladder with large hook at the top to grip the ridge of a pitched roof
- Step ladder, hinged in the middle to form an inverted V, with stays to keep the two halves at a fixed angle
- Turntable ladder, an extension ladder fitted to rotating platform on top of a fire truck
- Vertically rising ladder, a ladder designed to climb high points and facilitate suspending there.
Rigid ladders were originally made of wood,but in the 20th century tubular aluminium became more common because of its lighter weight. Ladders with fibreglass stiles are used for working on or near overhead electrical wires, because fibreglass is an electrical insulator.
a rigid ladder should be leaned at an angle of about fifteen degrees to the vertical. In other words, the distance from the foot of the ladder to the wall should be about one quarter of the height of the top of the ladder. At steeper angles, the ladder is at risk of toppling backwards when the climber leans away from it. At shallower angles, the ladder may lose its grip on the ground. Ladder stabilizers are available that increase the ladder’s grip on the ground.
A ladder standoff, or stay, is a device fitted to the top of a ladder to hold it away from the wall. This enables the ladder to clear overhanging obstacles, such as the eaves of a roof, and increases the safe working height for a given length of ladder.
- Rope ladders are used where storage space is extremely limited, weight must be kept to a minimum, or in instances where the object to be climbed is too curved to use a rigid ladder. They may have rigid or flexible rungs. Climbing a rope ladder requires more skill than climbing a rigid ladder, because the ladder tends to swing like a pendulum. Steel and aluminium rope ladders as sometimes used in vertical caving.
- Dissipative ladders are portable ladders built to ESD (Electrostatic Discharge) standard. Electrostatic Discharge is a natural occurrence in which electricity is passed through our body, or other conductor, and discharges onto some object. For example, the shock we feel when we touch a doorknob is an ESD. This natural occurrence is becoming a very hot topic in the field of electronics assembly due to the costly damage ESDs can cause to sensitive electronic equipment. Dissipative ladders are ladders with controlled electrical resistance: the resistance slows the transfer of charge from one point to another, offering increased protection during ESD events: ≥105 and < 1012 Ω / square.
- Pool ladders. A ladder is also used on the side of a boat, to climb into it from the water, and in a swimming pool. Swimming pool ladders are usually made from plastic steps with special grip and metal bars on the sides to support the steps and as handrails for the user.
- Assault ladders. These are designed to be used by units which may need to board or assault vessels or buildings. They can be used when a full sized ladder is not required or when working in confined spaces. Suited for covert operations such as sniper placement, and vessel boardings. It was developed and designed for tubular assaults including buses and trains and for first storey breaching. Its extra wide design gives the user greater stability, but still can fold away to be stored. It is available in standard aluminium or non-reflective black finish in 6 and 8 foot lengths.