woah, that's no good at all! i dont know a whole lot about roofs, but your plan sounds good to me. I guess the hard part is figuring out the correct ratio of air space to insulation. I would guess that if you give it 1-2cm of air space, you should be alright. But, if you cut it too close, you're just wasting your time. I would tend to think you should go on the upper end. 1cm of lost insulation would be worth it to prevent future buckling. I'll bet the coroplast will work well. I was looking for something similar this fall when I was redoing the insulation in my attic. All I could find was some crap at HD that was made of really thin polystyrene that looked like it could snap at any moment. Not something I spent any money on....
if you need any help this summer, let me know!!!
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