I live in a 60 year old stucco cinder block home in northern Ohio. When they built this house the studs to hang the drywall were hung flat to the brick wall. Then the drywall was simply hung on the studs. Leaving an air gap of 1 5/6 inches with absolutly no insulation. There are many homes in the area built like this. Besides costing $$$ to heat they also have a mold problem.
After ponderng this problem I have decided to remove the drywall on the outside walls and add 2 X 4's running the 4 inch way. This should give me a space of 5 1/4 inches to insulate. Some new wiring while I got it open and then new drywall and finish which the walls need anyway. HERE'S THE QUESTION: Would water resistant drywall be better for the reduction of mold? Cost isn't that much more especially if I only do the bottom half where the mold is. Does anyone have any suggestions.