what are joists?
<answer> It is one of a series of horizontal members supporting a ceiling or floor. <context> In architecture and in structural engineering, a joist is one of a series of horizontal members supporting a ceiling or floor. Joists are supported by foundations, wall framing, or beams. Joists are often laid out in repetitive patterns, much like the ribs of a human body. The intent of the use of this type of framing is to span over an open space below the members.