Tables 1 and 2 in this chapter are derived from the trada technology ltd.
Flat roof joist spans uk.
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.
The lengths and sizes of joists vary depending on the species and quality of the lumber used.
For timber floors between homes.
Span calculator for wood joists and rafters also available for the android os.
Surveyors span tables for designing roof rafters.
Should refer to trada document span tables for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice.
This span table is to the format and methodology given in bs 5268 7 2.
1 enter joist details 1 1 span and joist spacing.
These span tables are the equivalent of other industry standard span tables and are calculated to the same standards.
Flat roof joist calculator.
Also available for the android os.
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.
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.
The section sizes are based on regularised als or cls timber.
For pitched roofs flat roofs and ceiling joists.
This is the distance between joist centres.
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.
Suitable for uk building regulation approval.
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.
The full version allows any size.
If supporting lightweight partitions running parallel to joists provide two additional joists under each partition.
These spans were calculated using our flat roof joist calculation engine.
Span tables for solid timber joists.
Rafter and joist span faq.
Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.
This table uses commonly available uk regularised timber depths.
