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@Tenderloin I'm thinking of exactly this right now for our garden office thing (log cabin) I was looking at foil roll type stuff as it is potentially less space intensive but I don't really know how effective it is.
With the PIR insulations I guess you'd want to add some batons at equal intervals at the opposite direction to the roof struts then cut the PIR to size and slot in. If you make sure the batons are the same thickness as the PIR you can then clad in ply or something to hide the insulation.
andos
If I fit some PIR insulation to my log cabin roof (internally - so ceiling) what's going to be the best process I'd like to get a decent thickness but also not lose too much height.
Like this but only 4 sections