![]() ![]() I don't know too many reputable builders who deviate from the approved plans because it opens them up to liabilities. ![]() Ask your builder if he is following the plans or ask to look at the plans to confirm that this was part of the initial design. Many permit offices will require engineering if there are no span tables available for the specific application. 2021 Span Tables for Joists and Rafters (STJR) COVER. If a lumber rafter of similar or less size can work here, then the LVL definitely can as well. In addition, the standard roof rafter spacing used in the roof framing includes 12, 16, 19.2, or. For widths between those shown, spans are permitted to be. Building width is measured perpendicular to the ridge. Otherwise, the roof load and external pressures can exert too much weight on the framing. For instance, space the rafters 12 inches apart on-center for a 16-foot span. However, the actual spacing depends on various factors, notably the rafter span. 2 grade lumber of Douglas fir-larch, hem-fir, Southern pine, and spruce-pine-fir. The ideal spacing for 2×6 rafters is 16 or 24 inches on-center. However, rafter spacing may also be calculated by a professional structural engineer. Spans are based on minimum design properties for No. Using your numbers, the rafter span you are looking for in the code table 10'-1 11/16" Calculating the rafter spacing is determined by the prescriptive tables provided by the International Residential Code (IRC), which is found in Chapter 8. An LVL is manufactured without the natural defects that can be found in lumber, therefore an LVL can deliver better performance than a similar sized piece of lumber. ![]()
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