I guess I don't see this as that much of a problem.
The wall between the garage and the dwelling is not a true fire wall in the sense that it has no rating.
If my memory about BOCA is correct, all it requires is 5/8 dywall on the GARAGE side of the wall. All UBC and CABO requires is 1/2 in drywall on the GARAGE side of the wall.
The Interational code (that I assume we you all will be enforcing soon) reads as follows
R309.2 Separation required. The garage shall be separated from the residence and its attic area by not less than 1/2-inch(12.7 mm) gypsum board applied to the garage side.Where the separation is a floor-ceiling assembly, the structure supporting the separation shall also be protected by not less than 1/2-inch (12.7 mm) gypsum board or equivalent.
As you see even the Interational Residential Code doesn't call it a fire wall (it even seems to ignore whats on the side of the wall not facing the garage.
