2 Stress grade, and wet service conditions. Calculate the length of common rafters with this free and easy online tool by entering a dimension for the roof width, selecting a pitch for the roof, and the thickness of the ridge. 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. The longer the joist, the more area of deck the joist supports, and thus the beam supports more area as well. In addition, many residents prefer the fell of a deck that is designed for higher loads. You can change the values of any of the built-in loads, and if you have a load that isnt in the database you can also enter your own custom loads. Select each of the loads acting on the beam, enter its size and the calculator will work out the rest. 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. A database of commonly-used loads is built into the calculators. Example Calculation: Lets 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. Beam span maximums are based on a maximum anticipated live load as well as other factors. Review Maximum Safe Span: The calculated maximum safe span for the LVL beam will be displayed on the page. 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. Use ForteWEB to determine solutions for conditions beyond the scope of this table. For Canada switch to Canada Sizing Table Lookup. 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. Use the drop downs below to select your loading, house width, and material to calculate the appropriate size of TimberStrand or Parallam ridge beam.
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