For example, you can span a #1 grade (no knots) southern yellow pine joist a greater distance than a #2 grade of the same species (with knots). The lengths and sizes of joists vary depending on the species and quality of the lumber used. To calculate maximum spans additional species of lumber, use the Span Calculator or the Span Tables for Joists and Rafters on the American Wood Council website.Ĭonsiderations when using the Rafter and Joist Span Tables Contact your local building code officials to determine the building code for your area. Some other regions have special wind and seizmic requirements that should be considered when designing wood structures. For example, some regions get large amounts of snow, whereas others do not get any.
Before you can determine the maximum spans for joists and rafters, you must know the load requirements for your given area.
0 kommentar(er)
