https://www.woodworks.org/tools-guides/span-tables/
Span Tables & Design Values for Joists, Rafters, Headers, Beams & Girders
Mar 10, 2026 - Links to span tables and associated design values offered by industry organizations for various wood species and products.
span tablesdesign valuesfor joists
https://www.southernpine.com/resources/span-tables/
Span Tables - SFPA
Nov 20, 2025 - SFPA offers nearly 100 span tables for treated Southern Pine lumber, joists and rafters, and headers and beams.
span tablessfpa
https://caniuse.com/?search=ciu/wf-span
"ciu/wf-span" | Can I use... Support tables for HTML5, CSS3, etc
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https://caniuse.com/?search=ciu/wf-column-span
"ciu/wf-column-span" | Can I use... Support tables for HTML5, CSS3, etc
can i use