Flat Roof Joist Span

Permissible clear spans for flat roof joists to bs 5268 7 2 imposed load.

Flat roof joist span.

Dead load weight of structure and fixed loads 15 lbs ft2. Variations in ceiling construction nonparallel ceiling joist designs require additional support construction in the ceiling. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

This is the distance between joist centres. Span is clear span between supports. Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres. Also available for the android os.

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. Joist spacing of 24 inches is allowed for spans between 16 to 20 feet using 2 inch by 10 inch lumber of these three grades. 1 psf lbf ft2 47 88 n m2. View joist rafter tables.

Supporting imposed load for access and repair only. 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. At least 40mm bearing on supports. Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

Maximum slop3 10 deg. Span calculator for wood joists and rafters also available for the android os. Live load 20 lbs ft2 956 n m2 maximum span ft in nominal size. Usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size automatically calculate sizes suitable for supporting the loads below.

Joist breadth 47mm. 1 ft 0 3048 m. Click on a span to generate a full calculation you can adjust the exact span. Live load is weight of furniture wind snow and more.

1 in 25 4 mm.