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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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I found this online. "Thermax foamboard, a Dow product, has the fire rating to be left exposed without a fire-rated sheathing."
If I were trying to make that space usable I would use foam panels (leaving a venting gap with the roof underside) ) with sheetrock for extra protection.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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