About Span Calc
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 2021 National...
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 2021 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.
Apr 20, 2024
Version 2.15.1
FIXED : Multi-select popups are not appearing
Previous Versions
Here you can find the changelog of Span Calc since it was posted on our website on 2016-10-31 06:39:53.
The latest version is 2.15.1 and it was updated on 2024-04-27 19:09:52. See below the changes in each version.
Span Calc version 2.15.1
Updated At: 2024-04-20
Changes: Apr 20, 2024
Version 2.15.1
FIXED : Multi-select popups are not appearing
Span Calc version 2.15.0
Updated At: 2024-04-14
Changes: Apr 14, 2024
Version 2.15.0
Bug fixes
Span Calc version 2.14.13
Updated At: 2022-03-09
Changes: Mar 9, 2022 Version 2.14.13
- Product description has been updated
Span Calc version 2.11.19
Updated At: 2020-07-01
Changes: Jul 1, 2020 Version 2.11.19
Improved diagnostics
Span Calc version 2.11.19
Updated At: 2020-07-01
Changes: 1 Jul 2020 Version 2.11.19
Improved diagnostics
Span Calc version 2.11.18
Updated At: 2020-04-10
Changes: Apr 10, 2020 Version 2.11.18
Fixed:
Some buttons do not work on iOS 13.4
Span Calc version 2.11.15
Updated At: 2020-03-30
Changes: Mar 30, 2020 Version 2.11.15
Fixed:
- Crash when trying to print help screen
- Toggling some analysis settings on/off may cause other analysis settings options to disappear
Span Calc version 2.11.14
Updated At: 2020-03-18
Changes: Mar 18, 2020 Version 2.11.14
Fixed:
- Changing some analysis settings may cause the options for other analysis settings to disappear
Span Calc version 2.11.10
Updated At: 2020-03-07
Changes: Mar 7, 2020 Version 2.11.10
- Updated to support 2018 NDS® (National Design Specification).
- Improved support for Sharing, printing and emailing results.
- Fixed: Intermittent crash when an extended grade is selected and the Species is changed to a species without extended grades;
- Fixed: The Round Results switch is not visible in the Settings;
- Fixed: Rounded results are truncated to foot value, not nearest inch;
- Fixed: Crash when trying to export contents of help page;
- Fixed: Intermittent crash when updating Main Member type;
Span Calc version 2.11.9
Updated At: 2020-02-26
Changes: Feb 26, 2020 Version 2.11.9
- Updated to support 2018 NDS® (National Design Specification).
- Improved support for Sharing, printing and emailing results.
- Fixed: Intermittent crash when an extended grade is selected and the Species is changed to a species without extended grades;
- Fixed: The Round Results switch is not visible in the Settings;
- Fixed: Rounded results are truncated to foot value, not nearest inch;
Disclaimer
Official App Store Link
We do not host Span Calc on our servers. We did not scan it for viruses, adware, spyware or other type of malware. This app is hosted by Apple and passed their terms and conditions to be listed there. We recommend caution when installing it.
The App Store link for Span Calc is provided to you by apps112.com without any warranties, representations or guarantees of any kind, so access it at your own risk.
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