Looking for a ladder? Here’s some info to help you find the right one. The rigid ladder is usually the ladder type used for most tasks. There are many types of rigid ladders, from the fixed type to the roof ladder type. The fixed ladder is the most plain of these and has no moving parts. Extension ladders are often composed to two ladders where one can retract into the other for easy storage. Joined by a hinge at its top, and often forming an inverted V, are step ladders. If you need some space to place things like paint cans, you might need a platform ladder, which has a platform at the top. Ladders that have hooks to set them locked on the roof are called roof ladders. Aluminium is the choice material for various ladders, except those for electrical work.