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Finished Attic Heat Gain

Hello to all!

I need to figure out the heat gain for a room in a finished attic (R-11/dark roof). My understanding is that without a "proper" vented attic above, these rooms can get very hot.  Manual J  has "Roof-Ceiling Combination", but the HTM is less than "Ceiling under vented attic". Any help would be appreciated.

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