Roof Rafter Length Chart

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.

Roof rafter length chart.

The rise of the rafter. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. Includes result for hip valley factor slope factor and the roof slope in degrees. Here the number is 1166 66 inches.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Click the button to calculate the stock size needed for this job. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Here the number is 941 86 inches.

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. 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. Height of the scaffold. 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.

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

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. 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.