Ladder jack scaffold is a simple device consisting of a platform resting on brackets attached to a ladder. Ladder jacks are primarily used in light applications because of their portability. Ladder jacks are part of a ladder-jack scaffold system in which the jacks are attached to a set of ladders and then a scaffolding plank is positioned to rest on the ladder jacks. This type of simple scaffolding is useful for when you are working in one area for an extended period of time, or on an area that you cannot get a single ladder exactly where you need it (such as dead center on an upstairs window). It is meant to provide support for no more than two people working no more than 20 feet above the ground. Two people are needed to set up the system; each person climbs a ladder, holding an end of the plank. Once the plank is in place, you do not need the helper again until it is time to take the scaffolding down.