How to Vent and Insulate Enclosed Porch Converted to Entry Room
I have an enclosed porch that was previously converted to a living space of the house with heat etc. In the winter it was very drafty so I ripped down the ceiling and walls so I can properly insulate them. I have attached pics of the opened ceiling.
I plan to insulate all the walls with closed cell spray foam to stop air infiltration into the room. I have been considering using baffles up the underside plywood and spraying foam (maybe open cell) on the around the baffles but have seen that some don't think this is a good idea. So now I am not sure what to do.
The soffits of the former porch/entry room are vented, but it doesn't have a ridge vent, side vents, or anywhere for the air coming in to excape.
My goal is to turn this room into a finished entry room.
I need help with two things:
1) What do I do to properly ventilate the roof? What is the best way to do this?
2) How should I insulate between the roof and drywall? There is several feet of space between most of the roof and where the drywall will go. The rafters are 24" apart.
Thanks for your advice in advance!