In our example we have a 7 12 roof 7 inches of rise for every foot of run.
How to cut roof rafters youtube.
When you cut the rafters you ll need to make 3 separate cuts.
Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.
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The secret to making a good rafter is cutting the proper angle.
The roof rafters provide integral structural support to the roof.
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.
Rafter layout to lay out a rafter you need to know the roof slope and calculate the rafter run.
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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.