Underside of new roof

I have just had a new roof put onto my utility room, replacing the (UGH!) ancient and dirty corrugated plastic.The builder has used very good wood rafters and one nice beam down the center, but you can see the silver insulating material between the rafters. If we put plasterboard, it will hide the rafters. I wonder if anything will stick to that silver plastic surface. Not a surface to be painted.
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