Attached garage wall assembly – GreenBuildingAdvisor

CZ 3A/4A (N GA area) – 2001 gut reno

For context, the OSB seams on the exterior side of our attached unconditioned garage walls were not taped like the rest of the house was.

For the 3 walls that aren’t shared with living spaces:

My contractor mentioned insulating with fiberglass and then putting in 5/8″ drywall on the garage’s interior wall.

Without an exterior air barrier, would closing in this space with drywall be a recipe for a moisture mess? Is it better to just leave the garage walls open stud bays (or any other solutions)?

For the wall that’s shared with a living space:

We’re trying to decide on the best route for air sealing this wall effectively. The interior will be drywall with latex paint and rockwool.

We thought about putting OSB on the garage side and taping the seams – essentially treating it the same as the exterior of the rest of the home. Is that a good option, or does someone have another suggestion? Alternatively, would just adding 5/8″ drywall be sufficient?

If the taped OSB is the better route, can we add drywall directly on top of it (on the garage side)?