I did a lot of research on air flow and insulation at the beginning of this project, but I started to get into a flow and got a bit creative with foam-board sealed ridge air pocket.
My basic design is that the area behind the knee wall is sealed and insulated from the living spaces with baffling starting from knee wall up the rafters to an air pocket along the ridge (pocket lies between roof ridge and ceiling finish) 4 roof vents (approx 4 feet below ridge) allow outflow of air and soffits will allow inflow.
The plan is to staple r13 fiberglass over baffles. Create ridge barrier with 1 inch foam board with foil on two sides (see pics) and seal any gaps and cracks with spray foam.
My question lies with the foam-board ridge air pocket. Its feasible to do, but is it the best option?
The images below are captioned, let me know if more description or photos are needed for clarification.
R13 insulation over baffle on left. Baffles terminating at foam board below roof vent at center. Baffles exposed on the right.:
Another angle with exposed roof on the right:
These channels exist throughout, which is why I have to create air tight seal around baffling using spray foam and foam board: