This also makes it easier.
Framing and roof crickets.
Always frame the cricket at the same pitch as the roof and you will be within code guidelines.
Ok so a four foot wide chimney has a span of 4 foot and half of that is the run which is 2 foot.
2x8 sleepers should be nailed to the roof surface to pick up the ends of the rafters.
Secure the plywood triangles to the roof decking and cricket ridge with galvanized screws.
Do not check build roof planes.
In this example a pitch of 12 12 and 1 1 2 x 5 1 2 rafters are specified.
This beam will provide the backbone for the cricket or saddle.
Install a waterproof membrane over the cricket sides and edges fastened to the cricket with a construction stapler.
This is the number which we will use to lay out our rafter for the cricket.
Put metal flashing along the sides of the cricket nailed in place to overlap seams with the roof.
Here the build roof dialog is being used to set the defaults for manually drawn roof planes.