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@andos
@Señor_Bear yeah I did something similar with my shed.
I used 50mm PIR, made level with the lowest point of of the roof "joists". Sealed everything like crazy with foil tape and clad with T&G. I made sure there was ~50mm between the PIR and the roof to allow for ventilation, then I drilled little holes and regular intervals and capped them with these little circular vent covered to stop flies etc for getting in.
I feel like it's kind of working - we heat the space up a lot to make it possible to work in there. During the heavy snow up here the snow remained for quite some so the insulation must be stopping the heat leaving.