How To Size A Roof Rafter

The ridge beam is the vertical piece of plywood which will form the peak of.

How to size a roof 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. 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. 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.

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Rafter stock size calculator. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. This calculator is to be used as an estimating tool only.

Here the number is 941 86 inches. The pitch and span of your roof will dictate how long of a rafter you ll need use maximum span calculator to help you find your rafter size. If you look at the rafter span chart you ll notice that 2x4s can be used for rafters on spans up to 11. Divide the adjusted width.

Subtract the width of your ridge beam. Rafter stock size calculator. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. 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.

Input the rafter span on the flat eave overhang and pitch of the roof. Anything beyond that you are looking at using 2x6s for most sheds. Before you start cutting you first need to determine how long your roof rafters. Here the number is 1166 66 inches.

Input the rafter span on the flat eave overhang and pitch of the roof. 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 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. Calculating rafter length 1. Measure the width of your building.

Click the button to calculate the stock size needed for this job. Includes result for hip valley factor slope factor and the roof slope in degrees. Click the button to calculate the stock size needed for this job.