The shapes and spans shown here represent only a fraction of the millions of designs processed by alpine engineers.
Rafter span roof truss span tables.
View joist rafter tables.
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Straight line interpolation shall be permitted for intermediate spans and design values.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
More roof calculators roof truss calculator how to cut rafters.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Also available for the android os.
Rafter spans for southern yellow pine douglas fir and eastern spruce.
The calculated spans assume fully supported members properly sheathed and nailed on the top edge of the joist or rafter.
Alpine truss designs are engineered to meet specific span configuration and load conditions.
To size joists and rafters use the maximum span tables for southern yellow pine.
Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall.
These span tables assume installation of at least three joists or rafters that are spaced not more than 24 on center.
For pitched roofs flat roofs and ceiling joists.
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.
This rafter span calculator is species specific for douglas fir hemlock etc.
So this table could accommodate a house with a total rafter span or house width of 32 feet.
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.
This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.
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.
Span calculator for wood joists and rafters also available for the android os.
Surveyors span tables for designing roof rafters.
