Thanks for the advice guys- after the first couple of responses I went out into the garage. Unfortunately the main thing I accomplished was the realization that I suck at bulding shelves.
It is a detached garage, so no worries about CO coming into the house. And said "builder" was me.
And the insulation is R22 and I did use vapour barier, so I can't see the drywall tape and mud adding that much more insulation value.
Plus the garage was built on stub walls so they are at least 18 inches off the floor of the garage, so moisture isn't that serious of a concern. Some of you are probably right- that I may get some fading over time. I was all set to use OSB on the walls until seeing that most recent garage fire on the news. I figure with the Roxol insulation and the drywall at least I have a fighting chance in the case of fire.
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