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. Microllam ® LVL is engineered from large sheets of veneer laminated together to form a rectangular beam product. 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. Microllam ® LVL (Laminated Veneer Lumber) is one of the older Trus Joist ® products but still a versatile performer in a wide range of structural applications. For Canada switch to Canada Sizing Table Lookup. Select the application below you are looking to calculate. 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). Use these simple calculators to size Trus Joist TimberStrand LSL and Parallam PSL beams and headers. The lengths and sizes of joists vary depending on the species and quality of the lumber used. 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. Let's assume you have an LVL beam with a width of 5 inches, a depth of 12 inches, and it needs to support a uniform load of 1,000 pounds per square foot.Before determining the maximum spans for joists and rafters, you must know the load requirements for your region. The billet is cut to length and sawn into LVL beams, planks or panels according to customer´s requirements. The veneers are bonded with weather- and boil-resistant phenol formaldehyde adhesive to form a continuous b illet. Review Maximum Safe Span: The calculated maximum safe span for the LVL beam will be displayed on the page. Kerto LVL is produced from 3 mm thick rotary-peeled strength graded softwood veneers.Calculate: Click the "Calculate" button, and the calculator will compute the maximum safe span based on the input values.Allowable Fastener Spacing & Design for BCI Joists and VERSA-LAM. Input Data: Enter these values into the calculator fields. Joists Residential Floor Span Tables LVL-18, Tech Note, View, tech-note, us-east us-west. Load Tables, use FASTBeam software, or contact Georgia-Pacific Engineered Lumber Technical Services. Floor Edge Beams: 14: All: 40: 10: 1.00: Download a PDF, Tables 13 - 14: Roof Ridge Beams. Gather Information: You'll need information such as the LVL beam width, depth, and the uniform load that the beam will support. Joists & Rafters Headers & Beams : Size Selection Tables.Resists warping, splitting and shrinking while supporting heavy loads. Maximum Safe Span: feet How to Use the LVL Span Calculator: MICROLLAM® LVL BEAM BENEFITS: Uniform and predictable. Enter the required information below to calculate the maximum safe span for LVL beams or joists: LVL Beam Width (inches): Tables providing size selections for various beam spans and loading combinations for Southern Pine dimension lumber and Southern Pine glued laminated timber.
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