The tables below give maximum spans for rafters and beams.
Roof ridge beam span table.
Also see assumptions for table development.
Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002.
Design of single span ridge beams in roofs in houses office buidlings schools and other structures.
For each application a pdf download is available.
Loading conditions are detailed below.
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Distance from roof beam to next roof support i e the span of the rafter or roof truss from the roof beam to the next adjacent beam or wall.
As the table shows no 2x8 s meet the span and spacing requirements but a 2x10 with an e of 1 300 000 psi and fb of 1093 psi can span 15 feet 3 inches more than enough.
For lesser grades spans should be shorter.
Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Then drop down to find the appropriate fb value for the span.
Design engineers in accordance with.
Engineered wood products ewp lvl span and size charts.
The spans given in these tables have been developed by experienced timber.
Roof beams 20 verandah beams 22 garage roof.
Refer to sfpa s publication southern pine headers beams download in publications that includes all size selection and allowable load tables.
Pitching beams 23.
A 2x12 with an e of 800 000 psi and fb of 790 psi also works since it can span 15 feet and 10 inches.
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.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure.
The figures are based on quality materials.
