Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.
How to cut roof rafters youtube.
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And the secret to cutting correct rafter angles is the speed square also known as the rafter square which was invented in 1925 by carpenter albert j.
This video will show you how to figure length and cut a common rafter for a gable roof using a framing square.
Roof slope is the incline of the roof expressed as a ratio of the number of inches of rise vertical travel for every foot of run horizontal travel.
The roof rafters provide integral structural support to the roof.
The secret to making a good rafter is cutting the proper angle.
When you cut the rafters you ll need to make 3 separate cuts.
The rafter square makes it easier to cut the correct angles for anyone looking to make custom roof trusses.
In our example we have a 7 12 roof 7 inches of rise for every foot of run.