The mild steel joist beam is a secondary horizontal support beam. In a home, it directly supports all subfloors in a house and is always supported by a girder beam or beams. Joist beams will always run perpendicular to a girder beam. It is a large structural element that supports the weight of walls, ceilings, floors, and decks, as well as the people and furniture in a structure. Joist runs parallel to the surface they are used to support, which may include roofs, ceilings, or floors. The offered mild steel joist beam is made for use in the various industries.