Tables 1 and 2 in this chapter are derived from the trada technology ltd.
Flat roof joist spans uk.
If supporting lightweight partitions running parallel to joists provide two additional joists under each partition.
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.
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.
These span tables are the equivalent of other industry standard span tables and are calculated to the same standards.
Surveyors span tables for designing roof rafters.
This table uses commonly available uk regularised timber depths.
Flat roof joist calculator.
These spans were calculated using our flat roof joist calculation engine.
Suitable for uk building regulation approval.
Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.
1 enter joist details 1 1 span and joist spacing.
The section sizes are based on regularised als or cls timber.
Other span tables are based on the guidance given in bs 5268 7 1 which is a uniformly distributed load of 1 5kn m for spans greater than 2400 mm and 3 6 kn load per metre width of floor for spans less than 2400 mm to ensure that very small joist sizes do not result from the calculations for smaller spans.
Also available for the android os.
Span tables for solid timber joists.
This span table is to the format and methodology given in bs 5268 7 2.
The lengths and sizes of joists vary depending on the species and quality of the lumber used.
For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine.
This demo version is fixed at 1m clear span.
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.
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 pitched roofs flat roofs and ceiling joists.
This is the distance between joist centres.
For timber floors between homes.
The full version allows any size.
Usually 400 450 or 600mm but.
