Flat Roof Rafter Span Chart

2 are indicated below.

Flat roof rafter span chart. Roof pitch use recommended minimum roof pitches as specified by roof sheet supplier. These span tables apply only to flat roof and roof with a slope of up to 10 degrees. 1 psf lb f ft 2 47 88 n m 2. The lengths and sizes of joists vary depending on the species and quality of the lumber used.

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. 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. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. For pitched roofs flat roofs and ceiling joists.

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. Live load is weight of furniture wind snow and more. Span calculator for wood joists and rafters also available for the android os. Also available for the android os.

For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. Wood beam calculator american wood council website rafter and joist span faq. 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. Surveyors span tables for designing roof rafters.

Dead load weight of structure and fixed loads 15 lbs ft 2. Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74. Should refer to trada document span tables for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice. 1 ft 0 3048 m.