Long time follower, first time poster. 

Currently renovating my 1975 home in climate Zone 3A in Georgia. 4 sided brick on the main level, so an exterior tear down WRB replacement/addition on the outside is out of the budget currently. 

Home is sheathed in exterior gypsum board. 

Trying to decide on a solution for a decent stud bay vapor barrier (fluid applied?) against the sheathing. Planning on Rockwool R15 batts in the stud bays, followed by Intello air barrier. 

Any advice here would be much appreciated! 

Thanks,
Alex