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Mineral wool. It lasts forever without losing any of its performance, and is naturally fireproof, waterproof and bug-proof. You'd want the rigid board immediately behind the exterior siding inside the wall to block convection, and batts to fill in the rest of the framing depth. Ceilings are where you'd pile it as deep as you can without compressing it; hot air rises, so you want to trap the heat for as long as you reasonably can.

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