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When determining the span of a floor joist, use the horizontal distance between two vertical supports (see diagrams below and above). The span tables on this page are based on the #2 grade of four common species of lumber.
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Resources provide a simplified system to determine allowable joist and rafter spans in one- and two-family dwellings, and the companion supplements for tabulating allowable bending and modulus of elasticity design values for visually graded and mechanically graded dimension lumber.
Floor Joist Span Calculator. To use the joist span calculator below, first select the species of lumber you will use for your construction project from the drop-down list. Next use the buttons in the table to select the maximum length in feet (or metres in brackets) that your floor joists must span.
Maximum floor joist span for No. 1 and No. 2 Grade of Douglas fir are indicated below. Max. dead load (weight of structure and fixed loads) 10 lbs/ft 2 . Live load is weight of furniture, wind, snow and more.
Jul 30, 2024 · Use this floor joist calculator to determine the number of floor joists you will need and how much they will cost. You can also use this calculator to determine the maximum allowable span a floor joist can be depending on its wood species, grade, size, and supported load.
When sizing joists, use the clear span – the length from support to support – not the full length of the joist. Steps. Floor Joists. Step 1 Check The Code: First check the local code for allowable live load, dead load, and deflection (see Figure #2). For this example, I’ll use the ICC , which serves as the model for many state and local ...
SPFA has created 46 simplified maximum span tables based on common load conditions for floor joists, ceiling joists, and rafters for selected visual and mechanical grades of Southern Pine lumber in sizes 2×4 thru 2×12.
Floor Joist Span Tables - Use these tables to determine the maximum span of a floor joist, given the size, spacing, species, and grade of lumber.
To calculate the number of floor joists needed for your project, follow these simple steps: Measure the span: Determine the distance between support walls or beams in inches. Decide on joist spacing: Common spacings are 16″, 19.2″, or 24″ on center.
