TJI Joists Sizes
Depending on the series you choose, TJI joists are available in the following sizes:
Flange Widths: 1 3/4", 2 1⁄16", 2 5⁄16", and 3 1/2"
Depths: 9 1/2", 11 7⁄8", 14", and 16".
Joists are horizontal supporting members that run from wall to wall, wall to beam, or beam to beam to support a ceiling, roof, or floor. The wider the span between the supporting members, the deeper the joist will need to be. Lateral support also increases strength and keeps the TJI joists from deflecting under full load. Our designers use approved formulas for calculating the depth required and reducing the depth as needed. A general rule of thumb for calculating the depth of a wooden floor joist for a residential property is half the span in feet plus two inches; for example, the joist depth required for a 20-foot span is 12 inches.