Brandon - Thanks for the IRC 2006 contribution.
Jerry - Thank you for sharing your experience. You have a lot more than I. It's what makes this message board a valuable resource.

I have my doubts that the builder installed the insulation, air barrier, and vapor retarders to the underside of the roof deck.

I intend to write it up as 'in need of repair', understanding the risk I take. The builder may have installed the components exactly right, at which point ventilation is not required.

I wish I had a thermal imaging camera. For more reasons than one, but this would be a great application.

Regards,
Michael
Scher Professional Inspections