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AWC updates span calculator app with new design values

February 26, 2020  By American Wood Council

The American Wood Council (AWC) has released an updated Maximum Span Calculator for wood joists and rafters. The primary change is inclusion of updated design values as found in the 2018 National Design Specification for Wood Construction Supplement.

The free Span Calculator performs calculations for all species and grades of commercially available softwood and hardwood lumber. The calculator applies common uniform loading conditions and optionally provides adjustments for wet service conditions which allows calculation of allowable spans for outdoor deck joists. The “span options” mode allows selection of multiple species and grades for comparison purposes.

“The Span Calculator makes it a seamless process to calculate the code-permitted spans for various sizes, species, and lumber grades,” said AWC vice-president of engineering, Brad Douglas. “Now more than ever, complying with the latest building codes is crucial for ensuring safety, health, resiliency and energy efficiency that results from wood construction.”

The free updated Span Calculator app is available in the Android, iOS and Windows app stores. An update to the web-based calculator will be released later this year.


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