Ceiling Joist

Definition

Ceiling joists are the horizontal members in a building or structure to which the ceiling material such as plaster or drywall is fastened.

Purpose

Ceiling joists serve to support the weight of the ceiling materials and any additional loads, such as light fixtures or insulation. They help distribute these loads to the walls and other structural elements of the building.

Examples of Use

1. Attic Support: Ceiling joists in residential homes often double as the floor support for an attic space.
2. Drywall Attachment: In both residential and commercial buildings, drywall sheets are attached directly to ceiling joists.
3. Light Fixtures: Joists provide the necessary support for mounting light fixtures and other ceiling installations.

Related Terms

• Rafters: Sloped beams that support the roof and can be connected to ceiling joists.
• Beam: A larger structural element that may support the ends of ceiling joists.
• Truss: Pre-fabricated assemblies that can include joist components to form a supportive network.

Notes

• Proper spacing and sizing of ceiling joists are crucial for maintaining structural integrity and meeting building codes.
• Joists can be made from various materials, including wood, engineered wood, or metal.