Ceiling joists are horizontal structural members used in building construction to support the ceiling and any loads above it. They are typically made of wood or metal and are installed parallel to each other, spanning the distance between walls or beams. These joists help distribute weight evenly and provide stability to the ceiling structure. In addition to supporting the ceiling, ceiling joists can also create a space for insulation and electrical wiring. Proper installation of ceiling joists is crucial for maintaining the integrity of the building and ensuring safety. They are an essential component in both residential and commercial construction.