![]() A greater distance between two rafters allows them to span a shorter length. ![]() Those using this on-line calculator assume all liability and hold PLIB harmless from its use. Ceiling Joist Span Tables - Use these tables to determine the maximum span of a ceiling joist, given the size, spacing, species, and grade of lumber used. Once the rafter spacing is determined, the number of total rafters and their span can be calculated. Neither PLIB nor its members assume any responsibility for any particular design prepared from this on-line calculator. This calculator is to be used as an estimating tool only. The default ALL is a combined list of both NA and EU species. If desired, filter the species list by selecting NA for North American species only or EU for European species only. Choose one or more species/species grouping(s). Click the button to calculate the stock size needed for this job. Max Span Calculator Carson Swope T11:35:00-07:00. Example: In the rafter span table below, the highlighted cell (13-0) indicates that a 2' x 8' Douglas Fir rafter, with a grade of 2, spaced 24' apart, can have a maximum span of 13 feet - 0 inches (13-0) if designed for a live load of 20 Psf, and dead load of 20 Psf. PLIB believes the information generated by this calculator is accurate and conforms with design standards referenced by U.S. Sizing rafters is based on four variables: the size of the lumber, the span of the rafter, the spacing of the rafter, and the calculated snow load. Rafter Stock Size Calculator Home DIY Projects & Ideas Calculators Building Supplies Rafter Stock Size Calculator Input the rafter span (on the flat), eave overhang and pitch of the roof. This application requires Javascript and WebAssembly to be enabled.17 and/or the National Design Specification (NDS) Supplement published by the American Wood Council for adjustment factors. This application requires Javascript and WebAssembly to be enabled. ![]() For other service conditions or load conditions, see paragraph 200 a-l in WCLB Standard No. In calculating the design values, the change in strength and stiffness that occurs as lumber dries has been taken into consideration as well as the reducing in size that occurs when unseasoned lumber shrinks. Note: The design values shown in the table are for normal load duration and dry service conditions and are applicable to lumber surfaced either unseasoned (S-GRN) or dry (S-DRY or KD).
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