Here I developed the ground plan, profile and elevation to develop the valley sleeper.
This drawing shows the relationship of the valley sleeper bevel to the ridge line. This drawing is just a reference drawing. It has nothing to do with the dormer. I needed to make sure the valley sleeper bevel was the same geometric construction with any type of ground plan.
I placed the valley sleeper material over the develop drawing and scribed the lines to construct the 3D model of the valley sleeper.
Next, I did the same thing for the sloping ridge and the front gable rafter.
I couldn't reverse engineer the jack rafter perpendicular to the roof surface, so I decided to see if I could come up with any theories using a dormer with a ridge that is not sloping.
Here's the ground plan.
3D perspective of the dormer with a level ridge.
Here I developed the roof surface ignoring the valley sleeper. Using the standard folding roof surface development and developing the jack rafter on the roof surface developed the correct miter and bevel angles at the ridge.
In the next post I'll develop the dormer with a sloping ridge.