A floor-supporting beam member is named a Joist_in residential construction.
joist, ceiling or floor support in building construction. Joists—of timber, steel, or reinforced concrete—are laid during a parallel series across or abutting girders or a bearing wall, to which they're attached, usually by metal supports called joist hangers, or anchors. Habitat for Humanity; floor joists.
Floor joists are horizontal structural members that span an open space, often between beams, which subsequently transfer the load to vertical structural members. These joists, a part of the floor system, carry the load of everything inside a room, including walls, furniture, appliances, and even people.
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