ᐅ Insulation for Older Buildings

Hello everyone, I am new here and have some questions about exterior wall insulation...

Does the following layering sequence work and does it make sense?

I have a single-leaf masonry wall and want to add insulation afterward using mineral wool and Ytong blocks.

1. Masonry wall, e.g., brick (older building), 25cm (10 inches)
2. Mineral wool, X cm
3. Ytong block, smooth-faced, 5 cm (2 inches)

I hope this is clear :-)
I would appreciate any answers.

Hello,

berte schrieb:
....
1. Masonry e.g. brick (old building) 25cm (10 inches)
2. Stone wool X cm
3. Ytong plan block 5 cm (2 inches).....

What is the purpose of the PB plan block? Also, it hardly seems able to provide a stable finish!

Best regards

Thank you for the feedback. So, it should be similar to facing brickwork, except that the Ytong block will be plastered. There is also the option of ETICS (External Thermal Insulation Composite Systems), but I am not a fan of sealing the house airtight. That’s why the second masonry wall is ventilated from behind and connected to the main masonry with anchors.

From an energy efficiency perspective, this won’t make much difference.
How thick is the mineral wool supposed to be?
Everything seems very unstable; the next storm might cause parts to collapse or tear off. There are clear regulations on how an external insulation system must be fastened.

berte schrieb:
...but I’m not a fan of sealing the house airtight..

Breathable external thermal insulation composite systems (ETICS).. 😎

Vapor permeable – but where does the moisture go if there is plaster on it? If the plaster is weather-resistant, doesn’t it seal everything again?

Why are you not a fan of making the house completely airtight, berte? I think it offers quite a few advantages. With good insulation, you won’t feel extreme cold or heat inside the house (unless you open all the windows…). Sure, mold could possibly develop, but you can prevent that anyway by ventilating properly… or not?