Flat Roof Rafter Span Table

Dead load weight of structure and fixed loads 15 lbs ft 2.

Flat roof rafter span table.

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. 1 1 based on the horizontal projection of the roof rafter span. 1 psf lb f ft 2 47 88 n m 2.

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. Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. 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. 2 are indicated below.

Attached flat roof 1ao page14. Rafter span tables for surveyors roof construction surveyors span tables for designing roof rafters for pitched roofs flat roofs and ceiling joists 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. All flat roofs have a slight slope for drainage which can be created by the frame itself or by a sloped layer of insulation or other material underneath the exposed roofing. These span tables are the equivalent of other industry standard span tables and are calculated to the same standards.

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. This table uses commonly available uk regularised timber depths. 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. Rafter spans for southern yellow pine douglas fir and eastern spruce.

This span table is to the format and methodology given in bs 5268 7 2. 1 ft 0 3048 m. Live load is weight of furniture wind snow and more. Tables 2l and 2h list the sizes and spans for pergola or carport beams in low wind speed and higher wind speed areas.

These spans were calculated using our flat roof joist calculation engine. Span calculator for wood joists and rafters also available for the android os.