Rafter Span Roof Truss Span Calculator

Includes result for hip valley factor slope factor and the roof slope in degrees.

Rafter span roof truss span calculator.

Input the rafter span on the flat eave overhang and pitch of the roof. The lengths and sizes of joists vary depending on the species and quality of the lumber used. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. Rafter is a sloping beam usually wood that supports a pitched roof.

This rafter span calculator is species specific for douglas fir hemlock etc. More roof calculators roof truss calculator how to cut rafters. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. Use our online rafter length calculator to quickly compute the length of the shed roof rafter by entering the measurements of overhead length of roof span pitch or angle.

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Click the button to calculate the stock size needed for this job. For example if the roof rises 4 feet and the span is 16 feet twice the run. Rafter and joist span faq.

The rafter member will be longer. Span calculator for wood joists and rafters also available for the android os. This calculator is to be used as an estimating tool only. Click the button to calculate the stock size needed for this job.

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. If you plan to have overhang etc. To size joists and rafters use the maximum span tables for southern yellow pine. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run.

This is based upon the span of the rafter horizontal span not total rafter length live and dead loads. Also available for the android os. The truss is a framework consisting of rafters posts and struts which supports your roof. Input the rafter span on the flat eave overhang and pitch of the roof.

This calculator helps you make the rafters of the suitable sizes required for your roofing. Rafter stock size calculator. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. 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.

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