Yes, exactly, that's how it can work: only the additional insulation as continuous insulation above the rafters, and the intended insulation as insulation between the rafters. Then the battens are supported by the rafters (only nailed through the upper insulation).The counter battens are indeed screwed through the rafters by the continuous insulation above the rafters. See picture in the PM.
I still don't know what bothers you about it or how to do it better.Yes, exactly, it can be done like this: only the additional insulation as over-rafter insulation, and the intended insulation then as between-rafter insulation. Then the battens are supported by the rafters (only nailed through the upper insulation).
All good. Nothing "bothered" me, I was just confused that you spoke of overlay insulation. But you have now clarified that: you referred to "overlay insulation" only in relation to your addition, meaning in terms of the diagram as a layer 5a. That can probably be done that way. Whether it is "better" than the energy consultant's suggestion, I don't know. To me, it looks more like "more helps more," which I would rather mark with a question mark. I am rather skeptical of series connections of different insulation materials, but I am not an expert in this specialized field myself.Now I still don't know what bothers you about it or how to do it better.
Thank you very much for your help and I hope for a lot of input.
It hasn't sunk into the eternal meantime since yesterday yet???I would like to bring up the topic again.