Pitched Roof Timber Span Tables

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

Pitched roof timber span tables.

Surveyors span tables for designing roof rafters. Tables 1 and 2 in this chapter are derived from the trada technology ltd. Span tables for solid timber joists. 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.

Pitched roof timber sizes. Span calculator for wood joists and rafters also available for the android os. Trada eurocode 5 span tables 3rd edition bs 8103 3 7 2 3 design of pitched roofs the sizing and spacing of members shall ensure structural stability and provide restraint to the structure without undue movement or distortion. Here we have a wood framed gable roof.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. 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. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.

For timber floors between homes. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Continuing on from part 3. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

Also available for the android os. The section sizes are based on regularised als or cls timber. 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. For pitched roofs flat roofs and ceiling joists.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction.