Span Calc 17+

Span calculator using NDS‪®‬

American Wood Council

Designed for iPad

    • 3.6 • 8 Ratings
    • Free

Screenshots

Description

Calculator for Wood Joists + Rafters for all species and grades of commercially available softwood and hardwood lumber as found in the 2018 National Design Specification®

The American Wood Council (AWC) Span Calculator for Wood Joists and Rafters (Span Calc) performs calculations for all species and grades of commercially available softwood and hardwood lumber as found in the 2018 National Design Specification® (NDS®) for Wood Construction. Joists and rafter spans for common loading conditions can be determined. A span options calculator allows selection of multiple species and grades for comparison purposes.

Supported by the Softwood Lumber Board.

Maximum horizontal spans for joists and rafters are calculated based on the following assumptions and conditions:

· Joists and rafters are oriented to support vertical loads applied to the narrow (1.5 in. thick) face of the member, resulting in strong-axis bending.
· At least three joists or rafters are installed parallel to one another and spaced not more than 24 inches on-center, with properly designed sheathing attached on the top (compression) edge of each joist or rafter.
· Joists and rafters are single-span with adequate structural support at each end. The Span Calculator does not address cantilevered joists and rafters, multiple-span joists and rafters, or spliced joists and rafters.
· For joists and rafters, most building codes specify a minimum bearing length of 1.5 inches on wood or metal and not less than 3 inches on masonry or concrete. These minimum bearing lengths are to be used in the absence of calculated bearing lengths. Consult the local building code for specific requirements.
· Joists and rafters carry only combinations of dead load plus live load (D + L), dead load plus snow load (D + S), or dead load plus roof live load (D + Lr). The Span Calculator does not address wind load or seismic load.
· Buildings in regions with ground snow loads greater than 70 psf should not use the prescriptive provisions of the governing building code without approval of the authority having jurisdiction. Buildings in these high snow zones should be designed in accordance with accepted engineering practice.

While every effort has been made to insure the accuracy of the information presented, and special effort has been made to assure that the information reflects the state-of-the-art, neither the American Wood Council nor its members assume any responsibility for any particular design prepared from this Span Calculator application. Those using this Span Calculator assume all liability from its use.

What’s New

Version 2.14.13

- Product description has been updated

Ratings and Reviews

3.6 out of 5
8 Ratings

8 Ratings

Alaska Paul ,

Crashed but updated version works.

The update I received fixed the crash problem and it works well. Agree with the first reviewer on improvement suggestions. Just designed my friend's carport rafters with a 50 pcf snow load and cross checked. Works fine. Thank you!

Trout_Angler5391 ,

Very Useful!

It has become a great tool for quick and accurate adjustments in design!

VPofQC ,

Memory eater

Why does a wood span calculator require 150MB? That’s ridiculous.

App Privacy

The developer, American Wood Council, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Identifiers
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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