Flat Roof Rafter Span Table

R cb150 16 beam span table used w 3600 width of frame rafter span χ 6410 fascia beam span the cb150 16 beam achieves the 6000mm span for the fascia beam and can be used for the rafters.

Flat roof rafter span table. Rafter spans for southern yellow pine douglas fir and eastern spruce. 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. 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. 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.

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. These spans were calculated using our flat roof joist calculation engine. These span tables are the equivalent of other industry standard span tables and are calculated to the same standards. 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.

1 ft 0 3048 m. 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. This span table is to the format and methodology given in bs 5268 7 2.

2 are indicated below. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Dead load weight of structure and fixed loads 15 lbs ft 2.

1 psf lb f ft 2 47 88 n m 2. 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. Attached flat roof 1ao page14. 1 1 based on the horizontal projection of the roof rafter span.

Live load is weight of furniture wind snow and more. This table uses commonly available uk regularised timber depths.