Since one of the rafter's primary purposes is to withstand and transfer loads from the roof to the supports, their spans heavily depend upon the roofing configuration. The table below shows the maximum span ranges for a 2x10 comprised of four timber species.įor a detailed breakdown of span ranges in accordance with spacing and Grade of Timber, refer to the table R502.3.1 of the IRC 2021. The spacing determines the quantity of material required for constructing the structural framing system.Īlong with spacing, the grade of timber is influential in determining the maximum load-carrying capacity of the wooden element and, in turn, influences the span. IRC 2021 categorizes the maximum spans based on their spacings and species. 2x10 Span as Floor Joists 2 x10 Floor Joist The International Residential Building Code (IRC) provides information on the load-bearing and spanning capabilities of different grades, species, and sizes of construction timber. You can use a 2x10 construction wood as a floor joist, rafter, beam, header, or as framing component for the ceiling. The end-use of a structural component refers to how it is being used. Key factors to take into account include lumber species and its grade, subjected loads, spacing between two members, and the structural component’s end-use. The span or the length of the room that a 2x10 can cover is not solely dependent on the wood itself. How Much of a Span Can 2x10 Support on its Own? This article lists the maximum span of 2 x 10 under different situations for varying species of lumber. These values apply to Southern Pine Species. 2 Stress grade, and wet service conditions.A 2x10's maximum span depends on where it's used.Īccording to IRC 2021, a 2x10 with 16-inch spacing can span up to 18'-9" as floor joists, more than 26' as rafters and ceiling joists,4'-3" as beams, and 7' as headers without providing additional support. 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. 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. Beam span maximums are based on a maximum anticipated live load as well as other factors. 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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