Flat Roof Ceiling Joist Span

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

Flat roof ceiling joist span.

2 are indicated below. 1 ft 0 3048 m. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Span calculator for wood joists and rafters also available for the android os.

For example the highlighted cell below shows that a 2 x 6 southern yellow pine joist with a grade of 2 and spaced 24 apart can have a maximum span of 10 feet 0 inches 10 0 if you are designing your structure to support a plaster ceiling. Simplified span tables for southern pine lumber and glued. Sixteen inch oc spacing of ceiling joists made from 2 southern pine allows for a maximum 13 inch span length. Large room joist spacing.

Span is clear span between supports. For pitched roofs flat roofs and ceiling joists. Floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2. 1 psf lb f ft 2 47 88 n m 2.

Dead load weight of structure and fixed loads 15 lbs ft 2. 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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

Live load is weight of furniture wind snow and more. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Maximum slop3 10 deg. Supporting imposed load for access and repair only.

Surveyors span tables for designing roof rafters. 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. View joist rafter tables.

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. This will support a room ceiling that is 10 feet long on one side as in 10 foot by 15 foot or 10 foot by 17 foot rooms which is a standard dimension for many rooms in residential construction.