Difficulties with wood cladding including insulation on the facade

Hello,

we would like to clad the walls of our terrace, which is L-shaped and surrounded by 2 walls, with wood and at the same time install insulation, since our house (built in 1974) unfortunately is not insulated yet.

However, in the inner corner of these 2 walls there is only a strip of 5 cm space until the reveal of the patio door begins, so on one wall there is only a buildup height of 5 cm left to install insulation and a substructure for the cladding.

How can this problem be solved without the mentioned wall having less insulation than the other wall, or the other wall also having only minimal insulation?
Describing the problem is difficult, so I am uploading 2 pictures that hopefully make clear what I mean.

Even with more construction effort, unfortunately the door could not be moved, as on the other side it directly adjoins a load-bearing interior wall.

Thanks in advance for suggestions.
Best regards
AnMes

You only have this installation height, there simply isn't more available! This will naturally be quite tight, so you can roughly estimate that you could apply a maximum insulation thickness of 3.5cm. Even then, a wooden system must be applied on top, which can generally be glued onto the insulation.

But insulation of this thickness is actually pointless; even the 5cm you have isn't really sufficient. Would the rest of the house be insulated as well? I would probably limit myself to the wooden cladding and work without insulation, as it is hardly feasible. Even the wooden cladding becomes quite tight with 5cm of space, but it is doable.

First of all, we would be concerned with the cladding of these 2 walls, since our house has 6 exterior walls due to its L-shape, and at the moment we can only afford "cosmetics" on the house, so insulation of the entire house is currently out of the question. What are the risks if you insulate the wall with the door with, for example, 20cm, but insulate the other wall only with a maximum of 5cm or not at all?

Basically, I don't see a problem with that, but also little benefit in insulating only individual parts. Unless you take on, for example, the entire main windward side or something similar. But a professional should better say the exact details about such partial insulation.

The question I would rather ask myself is, what do you really expect from such partial insulation? I believe the effect is quite small, especially in the area with the 5cm insulation. Therefore, I would probably just focus on the aesthetic aspect. Just to make a rough estimate, if you want to attach wooden strips to a wall on a substructure, even the 5cm will be quite tight. But it should be possible with about 3cm battens and then strips/boards in the range of about 2cm.

For us, it would make sense that when we eventually insulate the other walls, we would not have to remove this wood paneling again to insulate behind it afterwards. The wood paneling itself serves purely an aesthetic purpose.

The corresponding walls face southeast and have a low insulation effort due to large window areas and low height, making them suitable for DIY work. The wall that could be more heavily insulated belongs to a 41m² living space, whose radiator is also located on this wall; here we would expect some energy savings. The wall that could be less insulated belongs to the bedroom, which we have wallpapered with insulating fleece, which has already helped significantly with the climate, but it could still be better. Additionally, this room (at the end of the L) has 3 exterior walls.

My biggest concern is that there might be building physics disadvantages if you insulate 20cm here and 3-5cm there. But an expert would probably need to give advice on this.

Thank you for your advice!