A strong, wooden member spanning foundation walls designed to support joist ends
A girder is a long, thick piece of steel or iron that is used in the framework of buildings and bridges. a strong beam, made of iron or steel, that supports a floor, roof, or bridge (gird). In building construction, a large main supporting beam, commonly of steel or reinforced concrete, that carries a heavy transverse (crosswise) load. In a floor system, beams and joists transfer their loads to the girders, which in turn frame into the columns