Flat Roof Joist Span

Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

Flat roof joist span.

1 ft 0 3048 m. Size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74 47 x 120 2 43 2 39 2 27 47 x 145 3 08 3 02 2 87 47 x 170 3 75 3 67 3 42 47 x 195 4 41 4 31 3 92 47 x 220 5 04 4 85 4 41 75 x 170 4 50. Tables 1 and 2 in this chapter are derived from the trada technology ltd. Also available for the android os.

Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. For timber floors between homes. This table uses commonly available uk regularised timber depths. The section sizes are based on regularised als or cls timber.

Live load is weight of furniture wind snow and more. 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. Span tables for solid timber joists.

Size of joists mm clear span c16 joist m clear span c24 joist m 47 x 95 47 x 120 47 x 145 47 x 170 47 x 195 47 x 220 1 77 2 40 2 89 3 38 3 87 4 36 2 04 2 75 3 47 4 20 4 93 5 66 floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2. 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. Span calculator for wood joists and rafters also available for the android os. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. 2 are indicated below. This is the distance between joist centres. 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.

Dead load weight of structure and fixed loads 15 lbs ft 2. Use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.