ᐅ 36 cm Ytong exterior wall, solid construction, mold formation, insulation

o.s. schrieb:
Can it be explained any more clearly?

What exactly are you expecting? The ultimate solution for free?

o.s. schrieb:
What do you two experts mean by “universal”?

Every statement, even those by experts, is influenced by individual (economic) backgrounds. Because of this, opinions naturally vary.
“Universal” is simply my perspective. In my view, competing demands can only be best satisfied through a “separation of powers.”

Best regards.

Hello,

I share a similar view to €uro. For the different functions of a construction, the most suitable building materials should be chosen. For load-bearing (structural stability), sound insulation, thermal insulation, and summer heat protection – all these different requirements cannot be met with just one single material.

Of course, the question always arises: What is important to me, what can I do without, and which compromises am I willing to make?

I believe a sustainable approach is sensible. Good thermal insulation, favorable physical properties, and low maintenance (considering the entire construction).

Best regards

Regarding load-bearing capacity (structural engineering), sound insulation, thermal insulation, and summer heat protection: All these different requirements cannot be met with a single building material.

Autoclaved aerated concrete proves otherwise.

From my perspective, insulated thermal bricks are not really a "single" building material either, but rather load-bearing elements with internal insulation.

Ideal is relative. If you mean profitable = efficient, okay. Ideal in terms of best possible, on the other hand, is pure waste of money.

1. Load-bearing capacity (structural engineering): is calculated. Regardless of the wall structure.
2. Sound insulation: Isn’t it primarily determined by the weakest components (windows)?
3. Thermal insulation: Is ensured by energy saving regulations. Further improvements are commendable but probably unprofitable in 90% of cases.
4. Summer heat protection: Okay, a bit of thermal mass for temperature phase shift should be present... or automatic shading systems (exterior blinds/shutters).
5. Don’t forget: External insulation (ETICS / external thermal insulation composite system) = faster soiling on weather-exposed sides! (Maintenance costs or impaired appearance)

Regards
Olaf

E.Curb schrieb:
.... All these different requirements cannot be met with a single building material.

Confirms my fundamental view!

E.Curb schrieb:
.... Certainly, the question is always: What is important to me, what can I do without, and what compromises am I willing to make?

Correct, but this assumes that the decision-maker has appropriate options (variants) available.
The interaction between the building structure, climate location, building orientation, user behavior, and the resulting sensible building systems technology is still often an unknown concept today.
At least some, in my opinion unfortunately too few, universities of applied sciences have now recognized this shortcoming and consequently offer a comprehensive and integrated education addressing this necessity. Sadly a bit late, but at least something!

Best regards

o.s. schrieb:
Aerated concrete proves the opposite.

Not at all!

o.s. schrieb:

1. Load bearing (structural calculation): it is calculated. No matter what wall construction.

Of course, it is calculated. But shouldn’t I also consider functionality and cost-effectiveness? For load bearing, the best building material is sand-lime brick.

o.s. schrieb:

2. Sound insulation: Isn't it mainly determined by the weakest elements (windows)?

Not only, if I’m not using old barn windows, that is. For sound insulation, the best building material is sand-lime brick.

o.s. schrieb:

3. Thermal insulation: The energy saving regulation ensures this. Further improvements are commendable but probably unprofitable in 90% of cases.

Thermal insulation cannot be achieved by the energy saving regulation alone. It sets the minimum thermal protection requirements, but it really doesn’t care which building material I use to achieve them.
The best building material for thermal insulation is not sand-lime brick.

o.s. schrieb:

4. Summer thermal protection: Okay, some mass for temperature phase shift should be there... or automatic shading systems (external blinds).

Here, not only heat gain through the windows plays a role, but also through the walls—and of course, the heat storage capacity of the building material.
The best building material for summer thermal protection is sand-lime brick.

o.s. schrieb:

5. Don’t forget: External insulation (ETICS / external thermal insulation composite system) = faster soiling on-weather-exposed sides! (Maintenance costs or impaired appearance)

I don’t really like ETICS from the outside, either.

You, from Schleswig-Holstein, have it easy. Not everywhere in the country has a tradition of cavity wall construction. Here in the eastern regions, based on my research so far, common wall structures for turnkey houses are as follows:

1. Aerated concrete 17.5 cm (7 inches) + exterior thermal insulation composite system (ETICS)
2. Sand-lime brick + ETICS
3. Liapor prefabricated concrete elements + ETICS
4. Solid brick, T10 unfilled

The additional costs for cavity walls are enormous. A turnkey house salesperson recently confided in me that, due to the high construction activity and the shortage of skilled structural workers, prices have increased by about 50%...