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I know closed cell spray foam would be the best for this application but I simply can't afford it. I live in Chicago and am trying to finish my attic as a conditioned space I have a dog house dormer that has 3 1/2 " walls and I already have some r 15 fib batt ins.that I would like to fill the vertical space with. The roof of the dormer as well as the rest of the roof will accommodate 6" of extruded polystyrene which I also have on hand will this work? I know it isn't the best way but do I have any potential problems?The main roof is a hip roof. Please answer.It's getting cold here. Thanks Rich