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I want to install 4x8 sheets of T&G plywood in my attic for extra storage room, but there are so many different thicknesses. There will be extremely minimal traffic on this floor as I will only be up there once or twice a year and for no more than 30 minutes to an hour at a time.

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Always be safe now rather than sorry later. For the small difference is cost, use 3/4 inch sheathing or underlayment. There are several good T&G underlayment brands out there, but T&G may be a little over kill for your application. Simple sheathing, CDX or underlayment should work fine.

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By underlayment, are you talking about something like 1/4" board that is used for things like vinyl application? I can't find any 3/4" sheathing, but I assume 23/32" would work just as well? –  oscilatingcretin Dec 11 '11 at 15:03
    
in today's market, 23/32 is what we call 3/4 inch. –  shirlock homes Dec 11 '11 at 23:26
    
No! not 1/4" vinyl and tile underlayment, I should have said sub-flooring. yes 23/32" –  shirlock homes Dec 11 '11 at 23:28
    
I decided to get 23/32" T&G OSB since the T&G cost was not that much more. Plus, T&G just makes me feel better in case I ever decide to further finish my attic in the future. –  oscilatingcretin Dec 14 '11 at 14:35
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It depends on the distance between joists or trusses, and the weight of the boxes/items you intend to store there. I personally would not use less than 1/2", and probably at least 5/8".

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