Rafter Span Roof Truss Span Calculator

This is based upon the span of the rafter horizontal span not total rafter length live and dead loads.

Rafter span roof truss span calculator.

For example if the roof rises 4 feet and the span is 16 feet twice the run. Rafter is a sloping beam usually wood that supports a pitched roof. It is the length of this portion of the rafter. The rafter member will be longer.

The important point to keep in mind when you use your truss calculator is that every truss calculation is completely unique and is based on the size of your roof and its specific dimensions. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. Also available for the android os. Span calculator for wood joists and rafters also available for the android os.

This calculator is to be used as an estimating tool only. Includes result for hip valley factor slope factor and the roof slope in degrees. Area span on the flat please enter area span on the flat in foot. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run.

This calculator is to be used as an estimating tool only. Input the rafter span on the flat eave overhang and pitch of the roof. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.

Click the button to calculate the stock size needed for this job. Rafter stock size calculator. More roof calculators roof truss calculator how to cut rafters. Click the button to calculate the stock size needed for this job.

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. This calculator helps you make the rafters of the suitable sizes required for your roofing. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. To size joists and rafters use the maximum span tables for southern yellow pine.

The lengths and sizes of joists vary depending on the species and quality of the lumber used. If you plan to have overhang etc. Input the rafter span on the flat eave overhang and pitch of the roof. The truss is a framework consisting of rafters posts and struts which supports your roof.

Note that this is not the actual length of the rafter.