Flat Roof Joist Sizes C24

For pitched roofs flat roofs and ceiling joists.

Flat roof joist sizes c24.

Where the tables do not apply or where there are concentrated loads floor joists should be designed by an engineer in accordance with technical requirement r5. Size of roof joists spacing of joists. The full version allows any size. 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.

Timber floor joists shall be adequate for the spans and loads and be correctly installed. Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists 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 4 38 3 99. 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. Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.

These span tables apply only to flat roof and roof with a slope of up to 10 degrees. 1 enter joist details 1 1 span and joist spacing. Enter a specific joist size 2 loadings dead load. Roof pitch between 15 and 22 5 degrees with rafter spacing strength class c16 size of rafters in mm 400mm 450mm 600mm.

These tables can help calculate whether floor joists are strong enough to support themselves and the load they carry without the help of any walls underneath. Surveyors span tables for designing roof rafters. Joists under each partition. Ceiling and flat roofs timber sizes and construction details.

Clear spans for flat roof joists in metres. Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. This demo version is fixed at 1m clear span. 400mm 450mm 600mm 97 x 47 1 84 1 81 1 74 120 x 47 2 43 2 39 2 27 145 x 47 3 08 3 02 2 87.

Solid timber joist sizes are provided in the bs 8103 3 span tables.