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Forgive me, after years of thermodynamics education I cannot help myself. Heat does not rise, hot air rises. Heat conducts and radiates, convection being the conduction of gas molecules gets its own category but it still is conduction on a mass scale.

I read your answer, and I am curious what you thoughts are for a hot unvented roof. With the addition of closed cell spray foam under the roof sheathing, bringing the attic into the conditioned space. Seems that major roof tile companies are on board and is allowed under new codes. A few studies show roof temps not grossly above traditional vented roofing systems.

From: Helping the hot air escape

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