Flat Roof Rafter Span Table

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

Flat roof rafter span table. 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. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. Tables 2l and 2h list the sizes and spans for pergola or carport beams in low wind speed and higher wind speed areas. 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.

1 psf lb f ft 2 47 88 n m 2. 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. 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.

Live load is weight of furniture wind snow and more. 1 ft 0 3048 m. Dead load weight of structure and fixed loads 15 lbs ft 2. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

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. Also available for the android os. 1 1 based on the horizontal projection of the roof rafter span. These spans were calculated using our flat roof joist calculation engine.

Span calculator for wood joists and rafters also available for the android os. 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. This span table is to the format and methodology given in bs 5268 7 2. 2 are indicated below.

This table uses commonly available uk regularised timber depths. Rafter spans for southern yellow pine douglas fir and eastern spruce.