OSB over sheetrock in attached garage
I have an attached one car garage. It was sheetrocked, taped, spackled and finished with a topcoat of white semi-gloss when the house was built 40 years ago, so as you can imagine, it looks like hell now. There are dents and gashes everywhere, stains, spraypaint overspray, nail pops, dimples, and cracks in the tape joints. Rather than repairing all of the damage, repainting, and trying to keep it looking nice, I thought of simply covering it over entirely with 7/16" OSB. I've seen this done before and from my understanding when it's being done on a new garage or one that's been completely gutted, sheetrock must be used for the common wall for fire safety. I've gotten conflicting reports as to whether or not the sheetrock or the OSB should be on top (or whether it matters), so I left a message with my local building inspector, but I was curious if anyone had experience with this issue here.