ᐅ Insulating a house with 30 cm thick walls?

Created on: 24 Jul 2017 23:53
D
DerZert
Hello,

the question of whether to insulate or not is increasingly being discussed, and of course, there are many related issues.
I am interested in the current knowledge of those who are more experienced with the topic than I am...

The property we purchased was built in 1965 and unfortunately has only 30cm (12 inches) exterior walls.
During the gut renovation, we didn’t notice any significant issues except at 1-2 spots in the basement.
Now, the basement and attic are going to be insulated, and new windows (probably double-glazed) will be installed.
Would you generally recommend an external thermal insulation composite system (ETICS / EIFS) for walls of this thickness?

Thanks for your effort!
D
DerZert
27 Jul 2017 20:22
For me, a cost/benefit factor (payback period) makes sense, as external thermal insulation composite systems (ETICS) are now viewed much more critically than a few years ago. I wanted to check the current status in relation to the respective masonry.

It is somewhat "shocking" when reading older posts on this topic, back when the thicker the ETICS, the better!

KfW55 standard is not of interest to me, and the energy saving regulations (EnEV) depend on the extension size.
11ant27 Jul 2017 22:11
DerZert schrieb:
I wanted to check the current status regarding the related masonry.

You can have various opinions about ETICS (external thermal insulation composite systems), but these are not specific to the type of masonry, neither for the intended nor the feared effects.
DerZert schrieb:
KfW55 is not relevant to me; the energy saving regulation depends on the size of the extension.

Yes and no. The current standard will certainly matter for the extension itself, and at least where the same rooms are involved in both old and new parts, I would consider a significant difference in U-values problematic.
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J
Joedreck
28 Jul 2017 04:39
Financially, something like this probably only pays off for you after a long time. The comfort aspect is also questionable.
How skilled are you with DIY work?
D
DerZert
29 Jul 2017 06:45
I would say an ambitious DIY enthusiast.
J
Joedreck
29 Jul 2017 08:12
For example, there is the option to insulate the building envelope using a curtain wall facade. This is a cost-effective way to address thermal insulation.