Trada Roof Rafter Span Tables
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2nd edition trada.
Trada roof rafter span tables. Contains section sizes and spans for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings. Part 1 introduction contents list of. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Free trada span tables pdf supersedes.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. 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. Maximum clear span of rafters in metres for roof pitches of between 15. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
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. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. 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 clear span of rafters in metres for roof pitches of between 15 and 45 degrees.
Now in its 4th edition the trada span tables publication is a must for any designer or builder. Roof pitch between 15 and 22 5 degrees. View joist rafter tables. 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.
Size of rafters in mm. Trada document span tables for solid timber members in floors ceilings and roofs for dwellings or ask your building control officer for advice. With rafter spacing of. Eurocode 5 span tables.
All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. Pitched roof timber sizes. Span tables for solid timber members in floors ceilings and roofs for dwellings. Easy to look up tables allow the reader to choose the size of solid softwood timber members necessary to give adequate support to floors ceilings and roofs in dwellings.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
