The Curved RAFTERS
I start by making a pattern for the curved shape of the rafters.
The pattern will be cut from thin plywood. I lay out a grid with tape measure, pencil, and straight edge.
Then I mark points where the curve intersects the grid.
I tap in a nail at these points then bend a thin strip of metal across them to form the upper and lower curve of the rafter.
I used a strip of linoleum edge metal for this.
I trace the curve on the plywood with a sharpie.
On the plans I also show the radius values for the two curves that make up the shape of the rafter. The curves could also be struck with a long straight piece of trim like a compass.
Over sawhorses I rough off a piece of the pattern to make the next step easier.
Then cut the upper profile of the pattern with a jigsaw. Then use a belt sander to smooth and shape.
I reposition the pattern to cut the other curve.
The location of the beam is also marked on the pattern then this birds mouth is cut.
We had our sawyer mill boards just over 12″ wide for these rafters. Alternatively, thinner boards could be glued up to get the width required but, it’s a lot easier to just have them cut to what you need.