Pitched Roof Timber Span Tables

Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.

Pitched roof timber span tables. Other more complex load condition spans can be determined with our free hyne timber design 7 5 software. For pitched roofs flat roofs and ceiling joists. For timber floors between homes. Eurocode 5 span tables for solid timber members in floors ceilings and roofs for dwellings 3rd edition.

The section sizes are based on regularised als or cls timber. 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. The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs.

They also tell you what the maximum spacing should be between each section or timber member. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. Pitched roof timber sizes the following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. Required size for a given span.

Surveyors span tables for designing roof rafters. 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. 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. Span tables for solid timber joists.

Rafter spans for southern yellow pine douglas fir and eastern spruce. So this table could accommodate a house with a total rafter span or house width of 32 feet. 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. Click here for structural design calculations.