2006 IRC sec R806.1 vs R806.4

Section R806.1 calls for ventilation on enclosed spaces formed by ceilings attached directly to the rafters..Section 806.4 allows for unvented attics but does not say that a ceiling can be attached. If you follow the prescriptive methods of section 806.4 for a spray foam are you allowed to put a ceiling over it (thermal barier) or are you obligated to vent it? Thanks!
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