Long side of plywood horizontally. I use locking clips between all rafters (this stops bowing and gives strength) and stagger all seems, and I cover all seams with a 4in wide weather barrier self sticking tape.Gable and eve sides and around breather vents and chimney and valleys get a ice/water shield barrier (36inch) in snow country and 24inch in warm. Something like a roof you do the best job once and no worries for 20-30 yrs.
The best thing is plywood not cdx for a roof and is against codes in a lot of places.
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