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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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You have some good info above.
A few comments:
Most floor construction is not concerned about strength, it's all about stiffness. For an attic floor, who cares? 1/2" plywood as PW suggests.. Plenty, on 1' centered joists. I don't like OSB so much. YMMV.
Wood moves (expands/contracts) most with moisture, not thermal. So, if it's a vented attic moisture content will change with the seasons.
Personally, I would not glue. It's nice to have access, should you want to run wiring in the future.
I take it that you want this for extra space for storing seasonal decorations and such. (?)
__________________
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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