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

11ant schrieb:
Well, I'm not a banker, but in my opinion, the additional effort required for an EH40 subsidy is fully or even more than compensated for in most cases.

Currently, you have a KfW subsidy of 170k at 1.32% interest. Assuming an interest saving of 3%, that amounts to roughly (discounted) 40,000–45,000 in savings over the fixed interest period. If you are already building a good house, it is definitely worth it (especially since many “prefabricated house builders” in timber frame construction offer this efficiency class as standard, at least outside the low-price segment). The paperwork costs you significantly less than the interest savings.
P.S. This applies only to the family subsidy, not the classic efficiency house subsidy. In that case, it is more of a break-even situation (but you get a “better” house for it).

sarajevo83 schrieb:
the offer of double boarding,

P.S.: I just forgot to mention something again that I had recently pointed out to you:

11ant schrieb:
Double boarding parallel or crossed? – both are more a matter of philosophy than a relevant difference in terms of how end customers are used to perceiving the term "quality."

A blanket double boarding is nonsense – a cheap show to signal to potential customers browsing brochures that you don’t hold back compared to other marketeers pushing products. Secondly, double boarding doesn’t always provide any real benefit, and first of all, there are many different variants of it that the supplier should kindly explain in detail. Simply applying another layer of the same type of drywall on top is a joke. And a wall cabinet doesn’t primarily need a silent board just so the kitchen radio doesn’t make the plates rattle. So what exactly should be doubled in the boarding: the wood-based panel (and if so, which one) and/or the drywall (or both)?

Exterior walls have studs (advertising term: studs) made of KVH (structural timber), where the wood-based panel provides rigidity; the same applies to load-bearing and/or bracing interior walls. For non-load-bearing partition walls, it is not required. Nowadays, these often use metal profiles, especially without cross braces for door openings, where the rigidity is supported by the drywall boarding oriented parallel to the vertical profiles, plus a second layer of the same boards applied crosswise. In wet rooms, the inner top layer is water-repellent. If a living or sleeping room adjoins on the other side, the construction should be vibration-damped for acoustic reasons. So you see: this is a topic that requires a nuanced approach, and “here’s a little treat for you” should be the last reason to add an extra layer of boarding for the customer. You don’t need double boarding everywhere, and certainly not the same type everywhere!

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nordanney schrieb:
Currently, you have a 170k KfW subsidy at 1.32% interest. Assuming an interest saving of 3%, this amounts to roughly (discounted) around 40–45k savings during the fixed interest period.

Exactly our calculation, thanks! Unfortunately, this cannot be overlooked. We can obtain this 170k subsidy. Therefore, the 30 cm (12 inches) Ytong house will not be sufficient. Possibly consider offering it with additional insulation.

11ant schrieb:
Double layers installed parallel or crossed? – both are more a matter of philosophy than a significant difference in the way end users usually understand the term "quality."

I'll check on that! Thanks for the tip!

sarajevo83 schrieb:
Therefore, the 30cm (12 inches) Ytong house will not be sufficient. Possibly consider offering an additional insulation layer.

To upgrade the 30cm (12 inches) Ytong "budget provider house" to KfW40 standard, I would guess that the subsidies might not be worthwhile and it will become significantly more expensive. At least with this provider.

sarajevo83 schrieb:
Just checking! Thanks for the tip!

I’m really curious about the response you’ll get – especially regarding the quality of the content.

nordanney schrieb:
To upgrade the 30cm (12 inch) Ytong “budget provider house” to KfW40, I would guess the subsidies won’t be worth it and it will become significantly more expensive. At least with this provider.

You can easily verify this by having the original poster contact Massivhaus Mittelrhein directly. The most straightforward way to achieve Porous Concrete (aerated concrete) in Energy Efficiency House 40 standard is using 42.5cm (17 inch) porous concrete blocks – combining 30cm (12 inch) blocks plus additional insulation panels would be, in my opinion, pointless.

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