Most plywood manufacturers recommend spacing sheets 1/8" to prevent buckling. The tounge and groove sheets are self-spacing and slide over each other, but full flat sheets need to be spaced. I usually use a 10 penny nail to get the recommended space between sheets. The roof sheets are most suseptible to some swelling. Failure to leave a small gap can lead to a wavy appearance, but is probably not structurally important.
If you search the words - plywood expansion gap - on the web you will find numerous references to this requirement. Most roof and floor sheeting is sized slightly smaller than 4'x8' and has the gap requirement stamped on the back.
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