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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/
Went into our loft for the first time since we moved in (in Nov '15... oops) over the weekend. It's a decent size considering we live in a 1930s chalet style semi (oo'er)...
The ceiling is insulated and there are some boards down but the rafters aren't.
I'm going to insulate then and fully board the floor to make better use of the space. Can I just nail up some marine ply to the rafters to keep everything neat? Should i add some sort of moisture barrier?