Wood structural design data has been updated since this page was created. For the latest up-to-date rafter span data, please use the Span Calculator on the American Wood Council website. Use these two tables for roof rafters with a slope of 3" in 12" or less. Use these two tables for roof rafters with a slope greater than 3" in 12".
Leave rafter span tables and return Home. By entering these inputs into the rafter length calculator, you will get a final number, which is the rafter size. Using this number, you will know exactly how much timber you will need. And by getting the prices of wood from your local home improvement store, you will know the exact cost of your roof project.
Here, you can see how each of the five inputs above were figured:. Once all of these inputs have been entered into the calculator, you will see that the appropriate rafter width is Gable width Span : ft.
Roof Length: ft. Roof Overhangs: ft. Cost of Roof Shingles. See Costs Near You! Start Here - Enter your zip. Published: October 11, There are: 8 Comments.
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