Insulation of brick wall with different thicknesses

Good day,

the core renovation of a single-family house, which was probably built around 1900, is planned.
Around the ground floor, there is a 24cm brick wall (top picture)
and from the first floor upwards, an 11.5cm brick wall (bottom picture).
The house is a half-timbered house with bricks in between.

What would be the best option for insulation?
or not to insulate additionally at all?

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What would be the best option for insulation?

First of all, there are basically two options. 1. Internal insulation ==> is always a stupid/difficult matter (dew point shift, costly, loss of space, etc.) 2. External insulation The thickness of the walls does not matter at all at first. If possible, always insulate from the outside – and if you are already undergoing a complete renovation, you could also qualify for funding.

Around the ground floor there is a 24cm wall of bricks (top picture) and from the first floor upwards an 11.5cm wall of bricks (bottom picture) The house is a timber frame with bricks in between.

I can't quite imagine it like that. Please explain the construction in more detail.

I can't really imagine that. Please explain the construction in more detail.

As you might be able to see in the pictures, the bricks were installed crosswise to the living space in the lower area (so that the wall thickness is 24cm).

In the upper area, as can be seen in the picture, they were installed lengthwise to the living space between the half-timbering (11.5cm wall thickness).
Unfortunately, there are no plans of the house available anymore. Neither at authorities nor in private hands.

As you might be able to see in the pictures, the bricks in the lower area were installed crosswise in relation to the living space (resulting in a wall thickness of 24 cm).

If you assume the current brick size, yes. My gut feeling also says that the infill is of more recent origin.

in the upper area, as can be seen in the picture, then longitudinally to the living space installed between the timber framing (11.5 cm wall thickness).

That may be, but neither says anything about the thickness of the timber frame wall. Infill on the ground floor only with headers, on the upper floor only with stretchers, due to different wall thicknesses ... honestly ... do you really believe that yourself?

Unfortunately, there are no longer any plans of the house. Neither at authorities nor in private hands.

At some point I will take a basic course in existing building forensics. But it won’t be cheap, that’s for sure.

If you base it on the current brick size, yes. My gut feeling also says that the infill is of more recent origin. That may be, but neither says anything about the thickness of the half-timbered wall. Infill on the ground floor only in headers, in the upper floor only in stretchers, due to different wall thicknesses ... honestly ... do you believe that yourself? At some point I will take a basic course in existing building forensics. But it won't be cheap, that's for sure.

I will remove more plaster next week to take a closer look… I am not from the construction industry, and can therefore only report what I have seen in a layman’s way. Structural engineers and an architect will come soon to assess it. Thanks to you all anyway