[rfuerst911sc]

Have a 3 bay garage in the backyard. The two bay garage was built first. Then the previous owner added the 3rd bay. The roof of the 3rd bay is attached to what was the outside of the 2 bay garage and sits on a masonary/stick built exterior wall. The roof is made of straight 2x4's that are 10 foot long. Roof is waferboard with metal roof. The exterior wall does have a soffitt with some vents but I see no value because there is no exit for the heat. So I was thinking of stapling 3 1/2 " kraft faced insulation into the 16 " on center 2x4's. I plan as my final interior ceiling sheathing to use 1/2 " foam insulation board. Does this sound like a decent way to go ? Winters are not that harsh here in Georgia but summer heat is strong. Advice please.