ᐅ Is a 30 cm aerated concrete (e.g., autoclaved aerated concrete) wall sufficient?

Not only for sound insulation reasons, but also to qualify for the KFW40 subsidy

sarajevo83 schrieb:
Currently, Streif Haus offers me all interior walls with double drywall panels,

To be honest, that’s not worth much (in terms of added sound insulation). Wood wool insulation, for example, helps a lot in timber frame construction. Personally, I find it much more interesting inside the house than on the outside—unless you live in a noisy area, like next to a main road/highway, airport, or similar.

sarajevo83 schrieb:
Sure, still waiting on Hanse Haus, but so far nothing matches Streif Haus. By the way, Cologne is playing in the first league, right?

Caught me, FC is currently back in the first league (literally not always on top of that, as I’m also passively unathletic). Where does nothing match Streif Haus: price-wise? (I can believe that). Am I not supposed to handle this personally? (You would have a local area bonus, usually I have nothing free before May). But for EMS / SIM / SU it’s faster, almost like as a private patient. For AK / EU / COC that no longer applies, due to logistical reasons. That’s why MüKä is more flexible than Vilbel.

sarajevo83 schrieb:
Because I currently live in an aerated concrete house and also know someone well who does. The sound insulation is terrible and absolutely not recommendable. Maybe the quality of the blocks has improved by now though.

Well, I was able to take a nap on the manager’s office sofa while work was going on in the hall. As I said, more errors can be made in construction and workmanship than in material choice.

MachsSelbst schrieb:
How should that work physically? Good insulation requires enclosed air, good soundproofing requires mass and as few air cavities as possible. Since aerated concrete is made by incorporating air pores.

That’s complete nonsense, even if it’s a long-standing common belief. Sound is managed with diffusion or stiffness, not mass. The air pores in aerated concrete and pore bricks are no problem because the air inside is sealed. However, the hollow chambers in unfilled pore bricks act as resonators that transmit vibrations rather than dampen them.

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11ant schrieb:
Where Streif Haus is unbeatable: price? (I can believe that)

Especially when it comes to interior finishes, the option of double drywall, tiled showers, motorized blinds, and many other extras that would be significantly more expensive with other providers.
So far, disadvantages include the rafter roof and air-to-water heat pump. Hanse Haus scores points here with underfloor heating and an air-to-water heat pump, as well as a higher-quality purlin roof.

I am honestly quite uncertain about soundproofing, but the eligibility for the KFW40 subsidy makes a significant difference in overall financing compared to a solid construction house, especially considering the large amount saved on interest compared to a conventional bank loan, so that should not be overlooked.

sarajevo83 schrieb:
many additional extras that would have been significantly more expensive with other providers.
So far, disadvantages: truss roof and air-to-air heat pump. Here Hanse Haus scores with underfloor heating and air-to-water heat pump, as well as the higher-quality purlin roof.

And if you offset the savings that Streif Haus makes on heating costs (no underfloor heating, but only a "cheap" air-to-air heat pump) against Hanse Haus, both end up at the same price? Or Hanse Haus is even cheaper. You are comparing apples to oranges.

sarajevo83 schrieb:
especially regarding interior features, the option of double-layer drywall, tiled showers, external venetian blinds, and many other extras that would have been significantly more expensive with other providers.
So far, disadvantages: truss roof and air-to-air heat pump. Hanse Haus scores here with underfloor heating and an air-to-water heat pump, as well as the higher-quality purlin roof.

I can’t imagine showers (even with shower trays) without tiled walls. External venetian blinds across the board don’t make sense; for example, on the north side, roller shutters are installed instead. The trendy “replacement villa” has a hip roof with an attic that is too shallow for hanging laundry anyway, which you access through a hatch used for storing Christmas decorations—what exactly should make a purlin roof structure more valuable here? It essentially just requires a concrete ceiling, which I don’t see adding any benefit.

sarajevo83 schrieb:
Although I am quite uncertain about sound insulation, taking advantage of the KFW40 subsidy clearly makes a significant difference financially (saving a large amount in interest versus a bank loan) in the overall financing compared to a solid (masonry) house, so that shouldn’t be overlooked.

Well, I’m no banker, but in my opinion, the extra effort required for an EH40 subsidy is in most cases fully or even more than compensated.

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