Rafter Span Roof Truss Span Calculator

Input the rafter span on the flat eave overhang and pitch of the roof.

Rafter span roof truss span calculator.

This calculator is to be used as an estimating tool only. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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. Input the rafter span on the flat eave overhang and pitch of the roof.

Click the button to calculate the stock size needed for this job. For example if the ridge beam is 1 5 inches thick subtract 3 4 of an inch from the overall rafter length. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters.

This calculator is to be used as an estimating tool only. Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. It will use the current cost of wooden rafters based on the average price found at home improvement stores. Rafter stock size calculator.

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. Widely known for producing a quality product for over 20 years barlow truss provide any type of wooden roof truss you need. Click the button to calculate the stock size needed for this job. Is a family owned and operated designer and manufacturer of wooden roof trusses in north central idaho.

Span calculator for wood joists and rafters also available for the android os. Also available for the android os. Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. This online truss calculator will determine the all in cost of your truss based on key inputs related to the pitch width and overhang of your roof.

If you are calculating rafter length from the center of the ridge beam as shown below you will need to subtract half of the thickness of the ridge beam from the top end of the rafter. Includes result for hip valley factor slope factor and the roof slope in degrees.