Roof Rafter Length Chart

The run of the rafter.

Roof rafter length chart.

Includes result for hip valley factor slope factor and the roof slope in degrees. Here the number is 1166 66 inches. The rise of the rafter. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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 ridge beam is 1 5 inches thick subtract 3 4 of an inch from the overall rafter length.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and 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. 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.

If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. The length of the rafter. Here the number is 941 86 inches. Height of the scaffold.

Rafter length using angle v r 2cos a rafter length using pitch v r 2 sqrt 1 p 2 where v overhang r roof span p pitch. Rafter run outer wall this should be measured starting from the center of the roof span and then extending to the very edge of the exterior wall. 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.