Beam Span Flat Roof Truss Span Tables

Timber to be covered these span tables do not apply to timber which is fully exposed to the elements.

Beam span flat roof truss span tables.

Span calculator for wood joists and rafters also available for the android os. Posts these span tables are designed for a minimum post size of 50 x 50 x 2 5mm up to a maximum height of 3 0m. 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. Total load psf duration factor live load psf roof type 55 1 15 40 snow shingle 55 1 15 30 snow tile 47 30 snow 40 20 snow 1 25 20.

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. 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. Roof pitch use recommended minimum roof pitches as specified by roof sheet supplier. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and 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. View joist rafter tables. For pitched roofs flat roofs and ceiling joists. Alpine truss designs are engineered to meet specific span configuration and load conditions.

These span tables apply only to flat roof and roof with a slope of up to 10 degrees. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Also available for the android os. The shapes and spans shown here represent only a fraction of the millions of designs produced by alpine engineers. 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.