![]() 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. Our VERSA-LAM LVL is manufactured the whether Grimes (Lena), Louisiana in Eastern United States, or in White City, Oregon for the Western United States. You can break up a long span of rafters by installing a purlin and bracing on the underside. VERSA-LAM laminated veneer lumber (LVL) beams and headers eliminate twisting, shrinking and splitting, and deliver flatter, quieter floors also structures. 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). The lengths and sizes of joists vary depending on the species and quality of the lumber used. Learn more about BCI® Joists and our sizing software GC Calc® or view the US Orient and US Westerly span and size charts. 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 BCI®Joists are specially constructed I-joists with flanges made from strong VERSA-LAM® coating veneer plod with orientation strand board web and approved water-tight structural adhesives, provisioning outstanding vigor both durability. Contact your local building code officials to determine the building code for your area. Weigh all of the elements when designing wood structures. Some areas have wind and seismic conditions. ![]() For example, some localities get large amounts of snow, whereas others get none. But also consider that treated LVL eliminates some traditional frustrations of working with wood, so it’s faster to build with and flatter when it’s done.Before determining the maximum spans for joists and rafters, you must know the load requirements for your region. So for a typical deck, upgrading to treated LVL costs about $2-3 more per square foot. ![]() VERSA-LAM ® cover veneer lumber (LVL) beams or headers eliminate twisting, shrinking and split, and deliver flatter, calmer floors both structures. Treated LVL is stronger, however, and may replace larger profile treated lumber. ENGINEERED WOOD PRODUCTS (EWP) LVL SPAN AND SIZE CHARTS. ![]() Treated LVL today costs about 60% more than treated lumber. Traditional treated lumber is more expensive today than it was only months ago. For side or other combined bending and axial loads, see provisions in 2018 NDS. IJ-05-US BCI / AJS Joist Nailed Connection to Hip or Valley Beam. For other end fixity conditions, contact Boise Cascade EWP Engineering. IJ-03-US BCI & AJS Joist Slope-Cut Reinforcement. IJ-02-US BCI Joist Span to Depth Ratio in BC Calc. IJ-01-US BCI/AJS Rim Joists and Blocking Panels Shear Transfer Equivalency. LVL framing lumber is super strong, straight, and works like wood. Treated LVL from Pacific Wood Tech uses proprietary Tru-Core ® technology, including treatment chemistry in both the glue and wood treatment, producing boards that are consistent, dry after treatment, not corrosive to fasteners, carrying 25-year transferable warranty. I-Joist List of US Product Technical Notes.
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