I have a two part question: I’m designing a home with a standing seam metal roof which is continuous over two different structural systems. Section 1 in the attached image will be stick framed with 2x12s and will have a vaulted ceiling. Section 2 is framed with trusses, and will have a ceiling attached to the bottom chord. I am presuming a warm roof for section 1. This is in New England: climate zone 5.

Question 1: Section 2canhave a cold/vented roof, but should it? I’m worried about the transition between the two strategies.

Question 2: Similarly, I’m uncertain as to how to transition between an un-vented/warm roof and a deep cantilevered eave. How does one protect against ice dams in this scenario?

Thanks for any input!