A load-bearing basis for the scaffold is a base jack or plate. The base jack has legs that attach to the foundation or floor joists of the building under construction. The base jack lifts the scaffold off the ground so that workers can reach all parts of the structure. Load-bearing scaffolds are usually made out of welded wire cages covered with plywood or similar planks. These scaffolds are then put up on the building site to provide a platform for work to be done on a large scale project. They should be assembled only by qualified personnel to ensure they are built correctly. Load-bearing scaffolds need to be inspected regularly for safety. Any defects such as broken wires should be repaired immediately before use. Load-bearing scaffolds are used in many types of projects, including but not limited to: commercial buildings, industrial facilities, schools, hospitals, museums, and casinos. They are also used when it is necessary to work at a height above floor level without using ladders or elevators. Some common uses for load-bearing scaffolds include: painting, wallpapering, plastering, tiling, decorating, woodworking, and general maintenance work.