Floor systems can be trussed, conventionally framed, or built with engineered wood products such as I-Joists. Both trusses and engineered wood products are engineered, and have wider nailing surfaces for the floor decking. Trusses are built with open chases for ductwork and have natural open spaces for plumbing and electrical wiring. Some engineered wood products have specified or marked notches that can be removed to allow for the same.

Floor truss systems are sometimes called System 42's, because to build them manufacturers turn the 2x4's on their side. This allows for shallow depths as well as a 3 1/2" nailing surface. Some floors are built from 3x2's, others from 2x4's.  Floor trusses can be manufactured with many different possible end conditions to accommodate different installation needs.

Bottom Chord Bearing

Bottom Chord Bearing

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Top Chord Bearing

 

Top Chord Bearing

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