Rafter Span Roof Truss Span Calculator

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.

Rafter span roof truss span calculator. Rafter and joist span faq. This calculator is to be used as an estimating tool only. The lengths and sizes of joists vary depending on the species and quality of the lumber used. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters.

Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. It will use the current cost of wooden rafters based on the average price found at home improvement stores. 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. Includes result for hip valley factor slope factor and the roof slope in degrees.

For example if the ridge beam is 1 5 inches thick subtract 3 4 of an inch from the overall rafter length. Input the rafter span on the flat eave overhang and pitch of the roof. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. This calculator is to be used as an estimating tool only.

Click the button to calculate the stock size needed for this job. 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. Widely known for producing a quality product for over 20 years barlow truss provide any type of wooden roof truss you need. Span calculator for wood joists and rafters also available for the android os.

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. Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length.

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. 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.