Material exterior walls and interior walls (KfW 55 standard)

So, is the conclusion ultimately a matter of "taste" whether to choose filled Poroton or KS + ETICS. Both achieve KFW55 standard and both insulate so well that in the end the windows are the weakest link in the chain.

[*]Is it also similar in price? [*]How about durability, in terms of "leaving something behind for the grandchildren" (in case there ever should be any)? [*]Bonus question: What minimum thickness should the interior walls of KS have to provide good sound insulation to the adjacent room?

"Taste" is not a matter of principle for everyone when deciding whether to build monolithically or with ETICS; many builders see it pragmatically. I personally prefer monolithic construction (without claiming absolute truth) and professionally I generally advise weighting the contractor or the chemistry between builder and contractor higher than whether someone offers the absolute one and only best test-winning brick. WITHOUT EXCEPTION, ANY top product can be turned into rubbish in the hands of a botcher. EVERY brick – no matter if it sings best or dances best – has its specifics in processing, and so you can also lay the foundation for building damage unintentionally with ANY brick if you don’t have its particularities "in your blood". The same applies to individual properties: acoustic problems arise far more often from design and processing errors at the connection to other components, where the gap between good and bad is many times greater than the range covered by table lab values of the materials. Also, price-wise you never have complete freedom: every contractor has two bricks he mostly works with, between which he chooses preferably according to the current personal purchase price; you can form an opinion on that – for example also from test magazines – about which one you would prefer. But with a third brick he will also pass on the dealer’s defensive price to you, because he won’t get volume discount conditions on three bricks. Also, proportional relationships between material thickness and properties are unfortunately wishful thinking in reality, no matter what the calculation says. Complex systems NEVER behave linearly. Look your contractor deeply in the eyes and ask yourself two things: 1. Do you trust his character, and 2. Do you trust his abilities? Before that, don’t read too many test reports because you urgently need a "cattle dealer’s instinct" like .

Good evening, I have the same question as the thread starter. Thanks , great timing to ask this here! So is the conclusion in the end just a matter of "taste" whether to choose filled Poroton or KS + ETICS. Both achieve the KFW55 standard and both insulate so well that in the end the windows are the weakest link in the chain.

[*]Is it also similar in price? [*]How about durability, in the sense of "leaving something for the grandchildren" (if there ever will be any)? [*]Bonus question: What thickness should the interior walls of KS be at least to provide good sound insulation to the adjacent room?

I find it very difficult to test something like this during a show house visit and hope for real experience values here, even if these are of course subjective. Sorry for sneaking in here like this. If this violates etiquette, please give me a brief note. Best regards

Good questions, nice that someone else feels the same way. I'm curious about the tips we will get.

Good evening,
I have the same question as the thread starter. Thanks , perfect timing to ask this here!
So, is the conclusion in the end just a matter of "taste" whether filled Poroton or KS + ETICS.
Both achieve KFW55 standard and both insulate so well that in the end the windows are the weakest link in the chain.

What do you mean by filled Poroton? We get Poroton t09d without filling and it is still KFW 55. We consciously did not want ETICS.

What do you mean by filled Poroton? We get Poroton t09d without filling and it is still KfW 55. We consciously did not want ETICS.

You are building with 42cm masonry, right? The standard "Poroton-Planziegel-T9-36.5cm" only achieves a U-value of 0.23 (<=0.2 is required for KfW). Although the question is whether 6cm less on the left and right makes that much difference. That's true. It is probably cheaper than the additionally insulated Poroton?!

You are building with 42cm masonry, right?
The normal "Poroton-Planziegel-T9-36.5cm" only achieves a U-value of 0.23 (=<0.2 is required for KfW). Although the question is whether 6cm less on each side makes that much difference. That's true. It's probably cheaper than the additionally insulated Poroton?!

See below. 36.5 cm. They always achieve KfW 55. Windows are, for example, for passive houses.

What do you mean by filled Poroton? We receive Poroton t09d without filling and it is still kfw 55. We deliberately did not want ETICS.

By filled, I meant in this context with regard to sound insulation. I was told that compared to aerated concrete, Poroton has worse sound insulation and that filling improves this. I am deliberately using the subjunctive here because of "dangerous half-knowledge" and "hearsay" :D

Thank you very much for the feedback. That makes absolute sense. The best material is useless if it is poorly put together. The question remains no. 2 – Is there a "winner" here

Or is the deliberate omission of the answer to be understood as follows: Durability, insulation, soundproofing are so similar in both materials that the choice of the desired stone/brick should not determine the choice of provider, so one should not limit oneself in choosing the construction company just because one prefers to build with aerated concrete instead of brick or vice versa?

Thanks for the feedback. I’ll take away not to be so stubborn, especially when you yourself really have no clue!