![]() ![]() VERSA-LAM ® laminated veneer lumber (LVL) beams and headers eliminate twisting, shrinking and splitting, press deliver flatter, quieter floors and structures. Manufactured with either LVL or high-grade lumber flanges and an enhanced OSB web, BLI joists are strong, lightweight, consistent and cost-effective. Using Table F-2 (Figure 3), check each lumber size to see if a 16-inch spacing will permit a span of 15 feet 1 inch. Quality and value are hallmarks of onCENTER BLI joists. The Table of contents indicates that Table F-2 watches these loading conditions. 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. ENGINEERED WOOD PRODUCTS (EWP) LVL SPAN AND SIZE CHARTS. Step 2 Span Table: Select the appropriate table in Span Tables for Joists and Rafters. 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. Beam width should be 1/4 to 1/3 beam depth. The width can be increased by laminating in multiples of 1 3/4 inches. ![]() The LVL beam thickness is usually between 1.75 and 7 inches. LVL beam sizes start at 24 feet to 44 feet long and can go up to 60 feet. The tables below describe the most common measurements according to local requirements for different Kerto LVL structures in floors, roofs and walls. Because of how strong it is, an LVL beam can span up to 60 feet. 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. Design a beam width based on the fact that the typical width of an LVL beam is 1 3/4 inches. Span tables for Kerto® LVL beams, panels, studs and I-joists help designers work faster and more efficiently. 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). BlueLinx onCENTER® Framing Systems includes the high quality components you need to assemble a solid floor that satisfies today’s design demands BLI Joists, onCENTER Beam and Header LVL or Glulam, Advanced Framing Lumber (AFL), and onCENTER Rim Board. The lengths and sizes of joists vary depending on the species and quality of the lumber used. With design properties far surpassing those of ordinary dimension lumber shallower depths, longer clear spans, and fewer intermediate supports all feasible. 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 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. BlueLinx offers a full line of depths matching our onCENTER BLI joist offering.Before determining the maximum spans for joists and rafters, you must know the load requirements for your region. pick the span you want (pick 4’0 for example) select the Fb column of the lumber you intend to use (in AF&PA Design Values for Joists and Rafters 2 hem-fir Fb 1104 psi & E 1,300,000 psi so use span table column Fb 1100). Manufacturing quality is monitored by the third-party inspection services of APA- EWS® and backed by a lifetime limited warranty.Ĭertified as APA® Performance Rated, onCENTER Rim Board encloses BLI joist floor systems, providing a flush perimeter edge with high vertical-load transfer capabilities. determine the total load per foot of beam. BLI joists are manufactured with low-moisture content material ensuring floor systems that are quieter, with greater stability and long-term dependability. As moisture evaporates from ordinary lumber, nails can pop and squeak resulting in costly call-backs and repairs. ![]() Quality and value are hallmarks of onCENTER™ BLI joists.
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