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Maybe just some kingspan / other PIR instead - you can install it between the rafters with a gap between it and the sarking, allowing air flow from the soffit / eaves.
Good advice.
This is what I did in my bathroom when I had the ceiling down.The air gap is key, otherwise you create a warm roof and that needs breathable membranes etc.
absurdbird
Maybe just some kingspan / other PIR instead - you can install it between the rafters with a gap between it and the sarking, allowing air flow from the soffit / eaves.