Rafter Span Roof Truss Span Calculator

For example if the ridge beam is 1 5 inches thick subtract 3 4 of an inch from the overall rafter length.

Rafter span roof truss span calculator.

This calculator is to be used as an estimating tool only. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Span calculator for wood joists and rafters also available for the android os. 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 stock size calculator. 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. The lengths and sizes of joists vary depending on the species and quality of the lumber used.

Is a family owned and operated designer and manufacturer of wooden roof trusses in north central idaho. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. Rafter length calculator calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Input the rafter span on the flat eave overhang and pitch of the roof.

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. Click the button to calculate the stock size needed for this job. 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. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

Input the rafter span on the flat eave overhang and pitch of the roof. This calculator is to be used as an estimating tool only. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. Click the button to calculate the stock size needed for this job.

Rafter and joist span faq. It will use the current cost of wooden rafters based on the average price found at home improvement stores.