The tables below give maximum spans for rafters and beams.
Roof ridge beam span table.
The spans given in these tables have been developed by experienced timber.
Pitching beams 23.
Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
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.
Loading conditions are detailed below.
Then drop down to find the appropriate fb value for the span.
Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002.
Design engineers in accordance with.
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For lesser grades spans should be shorter.
Engineered wood products ewp lvl span and size charts.
Continuous span beams are beams supported at three or more points along their length.
For each application a pdf download is available.
Design of single span ridge beams in roofs in houses office buidlings schools and other structures.
Refer to sfpa s publication southern pine headers beams download in publications that includes all size selection and allowable load tables.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
Roof beams 20 verandah beams 22 garage roof.
The figures are based on quality materials.
So this table could accommodate a house with a total rafter span or house width of 32 feet.
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.
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.
Also see assumptions for table development.