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I have found some 4 inch thick white styrofoam in 4x8 sheets. How well would it work for insulating the ceiling in my pole barn?

I have been a lurker on here for a long time, but this is my first post. I built a 28 x 32 extension onto my pole building for my shop. I insulated the walls with 2" rigid foam insulation and covered it with OSB. The ceiling has metal siding on it. I have a lot of 2" foam leftover so I...