Flat Roof Timber Joist Span Tables

Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.

Flat roof timber joist span tables.

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. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. They also tell you what the maximum spacing should be between each section or timber member 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. Tables 1 and 2 in this chapter are derived from the trada technology ltd.

Wane as allowed in bs 4978 2007 a2 2017 is permitted in all sections included in these span tables. View joist rafter tables. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. These span tables apply only to flat roof and roof with a slope of up to 10 degrees.

For pitched roofs flat roofs and ceiling joists. Joist spans over 4 5m provide 2 rows of strutting at third span positions. 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. 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.

Span tables span tables can be used to determine the size of a timber member of a particular strength class required for a given span. Solid timber strutting to be at least 38mm thick and be a minimum of three quarters of the joist depth. Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. Joists are to have minimum end bearing of 40mm.

Timber to be covered these span tables do not apply to timber which is fully exposed to the elements. The section sizes are based on regularised als or cls timber. 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. Proprietary strutting is to be used in accordance with manufacturers recommendations.

Surveyors span tables for designing roof rafters. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.