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Should always be 3/4 inch especially if your shingling, and OSB Is a great choice very stable, not prown to warping and inexpensive, the stuff can stay uncovered for months before you ad a vapor barrier. Its better to overbuild than under build, when in doubt, go with the beef..
Building codes are codes set by the State or city telling builders what they must use when building anything from a house to a shed or installing a pool for safety reasons among other reasons..for instance, when building a staircase, each stair rise cannot deviate more than 3/8s of an inch or that would be a code violation because it can cause tripping etc.. Or when building a roof the rafters have to be so many inches on center to handle a "load" such as snow...that differes depending where in the country you live.
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