Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Timber roof beams span tables.
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.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
View size selection tables.
Design engineers in accordance with as1684 1 1999 and include the most.
For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3.
Other more complex load condition spans can be determined with our free hyne timber design 7 5 software.
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The figures are based on quality materials.
Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications.
Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs.
Construction details should be in accordance with as1684 2.
Designing with roof rafter span tables lvl 2 0e 2900fb power beam anthony forest s co raising ceiling joists jlc roofdek manual structural roof decking and trays.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Technical diagram on page 35 30mm m aximum allow able sp ans mm sheet roof spacing mm rafter size 600 760 900 1000 1200 66 x 30 850 750 700 700 600 90 x 30 1200 1050.
The spans given in these tables have been developed by experienced timber.
Span tables f7 rafters a maximum roof pitch of 25 degrees is assumed.
For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
The tables below give maximum spans for rafters and beams.
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 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.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.
Ridge beam statics in timber framing log construction.
Roof beams 20 verandah beams 22 garage roof.
View allowable load tables.
Window door garage door headers supporting roof loads only.
Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders.
