A horizontal solid wood structural member used to support and stabilize floor joists along their length. Girders used in lumber floor assemblies are site fabricated typically using multiple pieces of 2 x 10 or 2 x 12 lumber nailed together.
Solid sawn girder - is dimensional lumber used in traditional home construction.
Laminated veneer lumber - is an engineered wood product composed of glued wood veneer layers. LVL is also known as structural composite lumber (SCL).
Parallel strand lumber (PSL) - is a high strength structural composite lumber composed of glued wood strands. It is a proprietary product marketed under the trade name ParaIlam®.
Glu-lam - is a stress-rated engineered wood product comprised of glued wood laminations.