Floor Joist Selector

Dimensional lumber spans per IRC Tables R502.3.1 and engineered I-joist spans from 6 manufacturers. Size by span or find equivalent substitutions.
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Size by Span

Required Span

Spacing (in. o.c.)

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Dead Load (psf)

Deflection Limit

I-Joist Depth Filter

Species (Lumber)

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Dimensional lumber spans per IRC 2021 Tables R502.3.1(1) and R502.3.1(2). Engineered I-joist spans per manufacturer published span tables at L/480 live load deflection, simple span, glued-nailed composite floor. Weyerhaeuser TJI (TJ-4000), LP SolidStart/PWT (Residential Tech Guide), Boise Cascade BCI (Eastern Builder Guide), Nordic Joist (NS-GT3), Georgia-Pacific Wood I Beam (Residential Guide), APA Performance Rated I-Joists (Z725H). Dead load baselines vary by manufacturer — see notes in results. Not all products are available in all markets. Green Stories LLC is a building design and consulting firm. All projects requiring a licensed architect are completed in collaboration with registered design professionals.