![]() If you tie your 8 ft rafters together at just the one the sheathing joint (center of length of room or 8 ft from one end. Allowable span tables are provided to simplify the selection of rafter and ceiling joist size for wood roof framing and cold-formed steel framing. Moment sigmaZ, where Z is the section modulus width height2/6 for rectangular section. ![]() This chapter contains two roof-ceiling framing systems: wood framing and cold-formed steel framing. I don't know too many reputable builders who deviate from the approved plans because it opens them up to liabilities. User note: About this chapter: Chapter 8 addresses the design and construction of roof-ceiling systems. 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. In other words, how much a joist or rafter bends under the maximum expected load. Many permit offices will require engineering if there are no span tables available for the specific application. Stiffness of structural members is limited by maximum allowable deflection. If a lumber rafter of similar or less size can work here, then the LVL definitely can as well. Using your numbers, the rafter span you are looking for in the code table 10'-1 11/16" 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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