Rafter Span Table

For pitched roofs flat roofs and ceiling joists. These rafter span tables provide the best reference to quickly and easily determine the maximum span for all grades of southern pine according to the 2018 international residential code. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

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Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002.

Rafter span table. So this table could accommodate a house with a total rafter span or house width of 32 feet. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Span calculator for wood joists and rafters also available for the android os. These eight tables are based on 16 o c. The imposed point live load that can occur anywhere on the span or the overhang. Surveyors span tables for designing roof rafters.

Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. This is set by the roof use you selected in the previous screen and cannot be modified. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Applications according to the 2018 international residential code.

Also available for the android os. View joist rafter tables. The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter. The focus is 20 psf live load.

Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings.