The rafter square makes it easier to cut the correct angles for anyone looking to make custom roof trusses.
How to cut roof rafters youtube.
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.
In our example we have a 7 12 roof 7 inches of rise for every foot of run.
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.
Before you cut your boards you ll need to measure the width of your building and calculate the exact length of each rafter.
Rafter layout to lay out a rafter you need to know the roof slope and calculate the rafter run.
When you cut the rafters you ll need to make 3 separate cuts.
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The ridge cut also called the plumb cut at the top of the rafter the birdsmouth cut.