Do not check build roof planes.
Framing and roof crickets.
Ok so a four foot wide chimney has a span of 4 foot and half of that is the run which is 2 foot.
Select build roof build roof from the menu and in the build roof dialog specify the pitch framing and any other attributes that you will need for the cricket.
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.
The cricket or saddle basically rests on top of the house roof to visually extend the porch roof gracefully into the house roof.
This also makes it easier.
You will need to use compound miter cuts for the cricket rafters.
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.
This beam will provide the backbone for the cricket or saddle.
Secure the plywood triangles to the roof decking and cricket ridge with galvanized screws.