Insulation of the attic of an old country house

Attached are pictures of the wall again. I cannot see any cracks in the clinker.

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when I see the pictures of the roof, simply putting insulation in between is not enough. First, the roof is in bad condition (you can partially see through, semi-circular beams...) and second, the achievable insulation thickness is too low and third, something windproof should be installed under the roof panels. Depending on what kinds of rooms are to be created and how much money is available, planning can be done.

The beams will be extended inward. This will create more space to insulate sufficiently. Later, windproofing should be adequate with a vapor barrier.

As mentioned regarding the roof:

Roof tiles
Battens
Insulation (with about 20 cm space to the battens) between the rafters
Cross battens in maximum (tolerable) thickness
Insulation again in between
Vapor barrier
Gypsum board

I would actually use OSB 3 boards instead of the vapor barrier first, but it depends on the roof structure and the load-bearing capacity. It will definitely be windproof. Personally, I would use stone wool as the material, as it offers slightly better heat protection due to its mass.
To me, the roof basically does not look damaged or damp. But I am also just an amateur.

As for the interior insulation, as mentioned, an expert is needed. Based on gut feeling, I would probably prefer wood fiber mats and clay plaster. However, I cannot say whether that is advisable regarding the dew point, etc. Moreover, of course, that is not really the cheap solution.

Good morning,

I have consulted the structural engineer again.
Roof insulation as follows:
Double up the rafters and insert at least 20cm of mineral wool WLG35, with a minimum 4cm gap to the battens for ventilation. Then a vapor barrier sd>=100, followed by battens and plasterboard.
Wall insulation also with 4cm ventilation, at least 14cm mineral wool WLG35, and a vapor barrier sd>=100. Supply air for the ventilation from the inside via [Schattenfuge] and exhaust air through the panels or the roof ridge.

Mineral wool is strongly recommended as it does not rot if it gets wet.
As far as I am concerned, everything is clear and in the next few days I will start doubling up the rafters. I still have to look at the execution of the [Schattenfuge] in detail.