Flat Roof Joist Span Tables

Span tables all span tables.

Flat roof joist span tables.

Surveyors span tables for designing roof rafters. These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center. The figures are based on quality materials. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

1 enter joist details 1 1 span and joist spacing. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Also available for the android os. Flat roof joist calculator.

View joist rafter tables. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. For pitched roofs flat roofs and ceiling joists.

Span tables for solid timber joists. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. Notches are not to exceed 0 125 of the depth of the joist and are to be located between 0 07 and 0 25 of the span from the support. Span calculator for wood joists and rafters also available for the android os.

Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5. The full version allows any size. Timber floor joists shall be adequate for the spans and loads and be correctly installed. Joists rafters simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Joist and rafter span tables. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. This demo version is fixed at 1m clear span. Span tables can be used to determine the size of a timber member of a particular strength class required for a given span.

The tables below give maximum spans for rafters and beams. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. They also tell you what the maximum spacing should be between each section or timber member. The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter.

Straight line interpolation shall be permitted for intermediate spans and design values.