Coming Soon

Lumber Span Guide

We're building this tool. Select species, joist depth, and on-center spacing — get maximum floor and roof spans for common framing lumber and LP or Weyerhaeuser engineered wood.

What this tool will do

Select lumber species: Douglas Fir, Hem-Fir, SPF, Pressure Treated
Choose joist or rafter size: 2×6, 2×8, 2×10, 2×12
Set spacing: 12", 16", or 24" on-center
Max spans for I-joist sizes (9-1/2", 11-7/8", 14", 16")
Floor (40 psf LL) and roof (25 psf LL) span tables

In the meantime

Our staff does this every day — bring your plans and we'll help you select the right joist size and spacing for your floor system.

Material Takeoffs

Drop off your plans — our team will lay out your I-joist floor system. Turnaround typically 1–2 business days.

View Engineered Wood

I-Joists (Pacific Wood Tech, BCI, Weyerhaeuser TJI), LVL beams, TimberStrand, Parallam — plus span reference tables in the product guide.

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