What is a joist in construction?
Photo Credit: Courtesy of 3DStockPhoto (construction image)
Joist. ... A joist is a horizontal structural member used in framing to span an open space, often between beams that subsequently transfer loads to vertical members. When incorporated into a floor framing system, joists serve to provide stiffness to the subfloor sheathing, allowing it to function as a horizontal diaphragm.