You'll need to ensure they can vent - it's in the US, IIRC, it's about a 2 inch gap between the insulation and the roof underlay to ensure good ventilation. Otherwise very straight forward.
edit: found this - about a 2" gap (50mm) - https://www.thegreenage.co.uk/tech/insulating-your-loft-rafters-a-step-by-step-guide/
Thanks for that. There's no membrane between the tiles and the rafters at the moment either. My thinking is:
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You'll need to ensure they can vent - it's in the US, IIRC, it's about a 2 inch gap between the insulation and the roof underlay to ensure good ventilation. Otherwise very straight forward.
edit: found this - about a 2" gap (50mm) - https://www.thegreenage.co.uk/tech/insulating-your-loft-rafters-a-step-by-step-guide/