Single-family house Which stone suits us?

Hello dear community,

We are currently planning our own home and are quite overwhelmed by the many controversial statements regarding walls and technology.

Our current ideas:

[*
City villa or possibly mansard roof if the development plan does not allow it; there should definitely be 2 full floors.
[*]It should be KFW 55, hoping to get better financing through the additional funding (equity capital apart from the property purchase costs is not available)
[*]The lower half should be brick-clad
[*]Controlled residential ventilation for better indoor climate and comfort
[*]We do not want prefabricated wooden houses.
[*]I have excluded Ytong because we are not handy and I always fear leaving equally large craters in the wall when I try to mount something..


Now the question arises for us regarding the type of construction.

As far as I understand, the following 3 options remain for us:


[*]Poroton
[LIST]
[*]Positive
[LIST]
[*]Drilling uncomplicated, possibly special dowels necessary?


[*]Negative


[*]Sound insulation is poor compared to the others
[*]Brick cladding involves high additional costs since usually only fine plaster is applied

[*

Sand-lime brick


[*]Positive
[LIST]
[*]Drilling uncomplicated
[*]Good sound insulation
[*]Brick cladding comparatively inexpensive since an additional facade is required anyway


[*]Negative


[*]Problems with algae growth on the ETICS

[*

Lightweight expanded clay aggregate / LIAPOR (possibly prefabricated walls)


[*]I find only few usable information on this, but from what I have read so far this could be an alternative?

Are my statements correct so far?
Have I forgotten to consider any essential aspects in my considerations?
How should information such as sand-lime brick having better sound insulation be evaluated?
Is that only of interest in noisy locations (airport, heavily trafficked roads, etc.) or should one think more about it?
To what extent are such properties as discussion capability of greater interest when planning with controlled residential ventilation?
Are my information about algae growth on ETICS outdated? Are there new variants that no longer have this problem?
Lightweight expanded clay aggregate / Liapor seems very interesting at first glance based on advertising promises, but somehow I cannot shake the feeling that I have overlooked something important.

I would be very grateful for your suggestions.

I would use aerated concrete as the backing wall + clinker. For the interior walls, sand-lime brick is very good! You achieve extremely good insulation values and a good indoor climate! Now some will complain that you shouldn't mix the building materials, as they have different physical properties. But this has apparently been combined like this forever, and I haven't heard anything negative about it. This dowel myth is completely overrated, nowadays there are great sets that make installing heavy objects very easy, even for amateurs. I would definitely not do sand-lime brick + ETICS. The idea of putting petroleum in front of the walls and then ventilating via controlled residential ventilation.... terrible. On the subject of algae formation: Almost all ETICS plasters are mixed with biocides. These ensure that no algae settle in the first five years. After this period, however, no biocides are left and algae form. This process can only be prevented by cleaning and repainting. But you have to constantly, at the latest every five years, get to it and renovate again. We don't even need to talk about fire behavior. Also, they are now classified as hazardous waste.

Every stone builds a house and every approved construction project meets the energy requirements... Are you building with independent architects? I would first look at what is mainly used in your area, what fits the picture, etc. Brick veneer in Bavaria can become disproportionately expensive, in Lower Saxony few build with Poroton (personal rather small sample from us).

What about the normal brick (possibly with filling)? That is actually my favorite, monolithic then with a very thick stone without additional external insulation. I am also absolutely not a fan of [wdvs].

Unbelievable what kind of nonsense the first reply contains ;) First of all, all the pub stories that exist were brought out :D

@TobiasW: You do realize that all buildings nowadays are constructed airtight (hello Blower Door Test), right? It doesn't matter whether you build with clinker bricks or slap arbitrarily thick ETICS systems on the wall, it’s airtight. And no, walls don’t breathe either, that’s physical "nonsense."

@Threadstarter: When it comes to single-family homes, it’s totally secondary what you build with, unless you have special conditions (like, for example, your house is directly on a busy street and soundproofing is extremely important). If that’s not the case, you won’t notice any difference inside the house whether it’s with ETICS, without ETICS, sand-lime brick, aerated concrete, brick, or...
I agree with : Build as it’s typically done regionally, so local companies are familiar with it. Good workmanship is many times more important than the stone or system you choose. The regionally typical approach is usually cheaper as well.

What’s the right choice? Ask 10 people and get 15 answers. Go to the pink forum and 85% will tell you to build with ETICS because separate systems are advantageous (one layer for statics, one for insulation, every layer does exactly what it does best) and you can achieve top insulation values with less wall thickness. Ask in the next forum and 85% will tell you to build with XXXX....

On the topic of controlled residential ventilation: In my opinion, it’s always mandatory nowadays, since buildings have to be airtight. No one manages to ventilate enough (unless they are unemployed). Secondly, it greatly increases living comfort.

: I wouldn't call that cheese.

It is clear that the structures are airtight. However, it does make a difference whether I use natural products as wall construction or put plastic in front of a calcium silicate brick. I will have better natural moisture regulation through the natural wall construction. A certain form of diffusion definitely takes place.