Reduce thermal bridging
I live in zone 4 and have open-cell foam on the underside of my rafters which will be an insulated cathedral ceiling. The rafters are 2×6, and I want to address thermal bridging while the drywall is down. I’ve read many other questions by other posters, and although I understand the merits of putting rigid foam on top of the roof sheathing, that’s just not feasible in my current financial state. Additionally, the roof is young and in no need of being replaced. I’ve considered the following scenarios:
1. Offset a another set of rafters and insulate with batts. If this option is available, then should the batts be faced or unfaced?
2. Put a layer of foam on the underside of the rafters.
What do you think?