![]() ![]() With the purlin/bracing installed, the long rafter span would be broken into two shorter spans, thus allowing the rafter to carry additional load.īefore you decide on lumber sizing and span, consult your local building code officials to determine design loads for your area. You can break up a long span of rafters by installing a purlin and bracing on the underside. When calculating the span of joists or rafters, use the horizontal distance between vertical supports. The number 1 grade material is more expensive than the #2 grade, but if you can use fewer or smaller number 1 grade joists or rafters in your design, you may actually save money.ĭepending on the availability and cost of various size framing materials, it may be more economical to use larger joists or rafters in your design because you can typically use fewer of them. 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). US EAST FLOOR LOAD TABLES VERSA-LAM® 2. The lengths and sizes of joists vary depending on the species and quality of the lumber used. The catalog is available in PDF format and can be viewed online or offline. Learn more about the features and functions of the models, such as the world chronograph, the perpetual calendar, and the radio-controlled time setting. To calculate maximum spans of 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 Download the latest catalog of Citizen watches, featuring the innovative Eco-Drive technology and the stylish design. Contact your local building code officials to determine the building code for your area. Weigh all of the elements when designing wood structures. 1 1/2 VERSA-LAM 1.7 2650 Joists Residential Floor Span Tables LVL-18: Tech Note: View: tech-note: us-east us-west: Allowable Fastener Spacing & Design for BCI Joists and VERSA-LAM. Some areas have wind and seismic conditions. Versa-Lam laminated veneer lumber (LVL) beams and headers lead the industry in bending strength and E-value, offering better performance and longer spans. For example, some localities get large amounts of snow, whereas others get none. Before determining the maximum spans for joists and rafters, you must know the load requirements for your region.
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