Observed arrival · 2026-08-25
SpanRef: Lumber Span Reference
A browser-based reference for checking joist, rafter, ceiling-joist, and deck spans against published tables.
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SpanRef organizes residential framing data by member type, lumber species, grade, size, spacing, and load case rather than presenting a single generic span answer. The homepage reports 1,002 published values across SPF, Douglas Fir-Larch, Southern Pine, and Hem-Fir, with IRC, AWC, and DCA6 source references. Its browser-based planner can check floor, roof, or deck members and assemble a material takeoff; the site distinguishes these preliminary figures from final structural design.
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