![]() 2 Stress grade, and wet service conditions. Note: The span chart below is an example of how spans charts are presented. Because building code and lumber spans are updated from time to time, you should always check to make sure the span chart you are using is up to date. See the applicable code section, or the NDS to confirm the span chart you are using is correct.ĭimensional Lumber Deck Beam Spans Supporting a Single Span of Joists with or without Overhangs:Īssumes 40 psf live load, 10 psf dead load, L/360 simple span beam deflection limit, cantilever length L/180 deflection limit, No. This helps to ensure that the project is completed safely and to the highest standards. Using the table, a contractor can determine the maximum span their beam can safely support. If the section modulus in step 4 is less than the required modulus times 2 (factor of safety) then the beam is not strong enough. The longer the joist, the more area of deck the joist supports, and thus the beam supports more area as well. This table provides the maximum allowable span for each species of lumber, as well as the size and load of the beam. So for a 2 by 6 beam with actual dimensions of 1.5 x 5.5 inches this would be: 1.5 (5.5)2 / 6 7.6. In addition, many residents prefer the fell of a deck that is designed for higher loads. 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. Resists warping, splitting and shrinking while supporting heavy loads. All you have to do is input the span of the beam, the magnitude of the point loads, and their distances from support A. MICROLLAM® LVL BEAM BENEFITS: Uniform and predictable. ![]() Calculate live load: Choose a beam with a capacity that is equal or higher in the column for live load. ![]() Building codes for residential decks only require 40 psf in some areas, but check your local requirements to make sure you are aware of any additional local guidelines. Considerations when using the Rafter and Joist Span Tables. Our calculator is easy and simple to use. Pollmeier LVL 2.1E Design Guide Single Span Load Tables - Floor Load 04 - 21 - US Sheet 6 /29 How to use maximum uniform load tables 1. Remember that plumbing or electrical services likely run through the wall. ![]() A beam that is undersized for the load it carries can be a very serious problem. Beam span maximums are based on a maximum anticipated live load as well as other factors. Consult span tables or, better yet, hire a structural engineer to determine the proper dimensions of the beam youll be adding. Fewer posts on upper-level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans. The span of a beam is dependent on a few variables: The grade and species of lumber, size of lumber and the load it carries. ![]()
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