"or directly insulated." The roof has insulation directly against it(between the roof decking and ceiling) which will be similar. In a situation where there is a large cavity such as a flat ceiling and a sloped roof, that extra space needs to be vented unless the roof itself has insulation directly against it. In a case where there is a flat ceiling and an open cavity with insulation against the roof(called a 'hot roof'), the entire cavity is considered conditioned space since normally you wouldn't put insulation against both the roof and between the ceiling and the living space, its one or the other, otherwise issues with moisture become a real problem unless that space is vented and if its vented you wasted some money on insulated both sections. ..unless the 'insulation' against the roof is a reflective heat barrier but I don't consider those insulation like some people say they are. I like to use insulation as a term used for a barrier to conductive heat transfer, hopefully in conjunction with a proper convective heat barrier as part of the system.
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