Check sources for availability of lumber in lengths greater than 20 ft.
Roof beam span table douglas fir.
Span exceeds 26 ft in length.
This span table excerpt shows two possible sizes of built up floor beams 2 x 10 and 2 x 12.
The table below shows an excerpt from a maximum span for built up douglas fir floor beams table for supporting not more than one floor.
The full table shows more lumber sizes.
Roof live load 20 pounds per square foot ceiling not attached to rafters l 240.
Douglas fir larch ss 10 5 16 4 21 7 note a note a 10 5 16 4 21 7 note a note a.
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.
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Sample floor beam span table.
This table is simply a sample and may not be valid for your region.
There are several beam span tables for all the species of wood.
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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.