Pitched Roof Timber Span Tables

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.

Pitched roof timber span tables.

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. Also available for the android os. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

Span calculator for wood joists and rafters also available for the android os. Span tables for solid timber joists. Tables 1 and 2 in this chapter are derived from the trada technology ltd. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof.

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Here we have a wood framed gable roof. Let s consider a basic gable wood roof framing design.

Continuing on from part 3. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Pitched roof timber sizes. For timber floors between homes.

The section sizes are based on regularised als or cls timber. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. 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. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.

For pitched roofs flat roofs and ceiling joists. Surveyors span tables for designing roof rafters.