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I would consider foam sheet insulation and cut to size. At Home Depot or Lowes and is blue in color. What ever R value will fit. Reflectix is a type of radiant barrier and also has some insulating properties in that there is some plastic filler with an air gap in between the two sides of the product. That should always be on the outside of any insulation. I wouldn’t use bat insulation because if it gets wet, it’s a mess. Foam will repel water. You can cut foam with a fine blade jig saw easily. That would be my recommendation.
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