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

sarajevo83 schrieb:
Unfortunately, the additional cost for the filled blocks and energy consultant far exceeds the benefits I would get from the KFW40 subsidy.

Hmm. What a surprise, which we already mentioned to you a few pages ago. So it will be a completely "normal" average house in terms of energy efficiency.

How is it possible that just three days after receiving an offer for 30cm (12 inches) Ytong blocks, you suddenly get offered a 36.5cm (14.5 inches) Poroton house? Is there no planning happening on your end, or do you just go door-to-door taking any houses without really considering them and only focus on the blocks? Or is the block considered fixed and then a house is sought to fit? You seem pretty confused. At least, that’s how it comes across.

By the way, with a Poroton T9 brick, using a dowel doesn't provide significantly better load capacity than with a Porous Concrete PP2 insulation block. The Fischer Duo Power 10x80mm anchors can support a maximum of 40kg (88 lbs) in hollow bricks and 30kg (66 lbs) in porous concrete. The shorter 10x50mm (3/8x2 inch) anchors hold only 25kg (55 lbs). Using 14x70mm (9/16x2 3/4 inch) anchors doesn’t improve this either—still a maximum of 40kg (88 lbs).
My kitchen cabinets are mounted on exterior walls made of PP2 porous concrete using 14mm (9/16 inch) Tox anchors and 10mm (3/8 inch) Spax screws. According to the datasheet, each dowel supports a maximum of 40kg (88 lbs) as well.

So if anyone thinks they are clever by choosing Poroton because they believe they can hang more weight or that it is generally more stable, unfortunately that’s not the case. 😉

MachsSelbst schrieb:
So if someone thinks they’re smart and chooses Poroton because they can attach more to it or because everything is generally more stable… unfortunately, that’s not true

The original poster relies on the cladding for the load-bearing capacity (or was it the sound insulation?).

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https://www.linkedin.com/company/bauen-jetzt/

11ant schrieb:
For the load-bearing capacity (or was it the soundproofing?) the OP is relying on the cladding ;-)

This is going to be an interesting house. The OP has spontaneously decided on the T9. Then another layer of cladding? An intriguing story. … at least until tomorrow, when a new idea appears as the "miracle solution" again…

user-d29 schrieb:
It will be an exciting house. The original poster already spontaneously chose the T9. Then another layer of cladding? Interesting story.

Oh, that was just a quick remark from me earlier, pulled out of my box of SCNR-wit...

user-d29 schrieb:
... at least until tomorrow when a new idea for a "miracle solution" is found...

... he’s actually not really a miracle-solution finder. However, we are in a forum that doesn’t center around philosophy (where I would fully understand if he enjoyed the pleasure of searching and wandering). This is a forum about house building (which is also the immediate reason he is here). Here, he patiently receives one answer after another, and from me—including the repeated invitation to basically take the express lane to my schedule—the encouragement to gain knowledge by unlocking expertise, evolving from someone asking and searching to someone knowing and finding, able to easily apply a ready-made solution to his specific individual project.

What I am doing here almost tirelessly is giving voice to Dieter Meier’s words from Domingo de Santa Clara and explaining that the expert knowledge needed by builders is neither alchemy nor a book with seven seals, but something quite ordinary; I myself was a secondary school graduate with a focus on classical languages. Two plus two remains four from all angles, and you don’t need a scholar for my house-building plan. Thanks to the forum’s search function with keywords like "@Gerddieter warns," "self-contracting"/"direct contracting," or the like, anyone can be protected and strengthened in a weekend course against being fooled at pub tables in April or being taken advantage of by salespeople. And yet some sit there like a rabbit in front of a snake, like an ox before the mountain, or a cow before a new gate, believing old wives’ tales or waiting for Godot.

Could the original poster’s origin (Sarajevo) play a role in this specific case? — we already have a similar long-term seeker here (@prm2021, https://www.hausbau-forum.de/threads/grundriss-planung-2-vollgeschosse-ca-130-140-qm-ohne-keller.u4x6k8/). He likewise passionately goes around in circles and struggles to see the forest for the trees (or even to grasp them when basically led by the hand). Sometimes I don’t understand it; mentality might be an attempt at explanation. I am from eastern Germany—if someone doesn’t know or can’t do something, they go look for someone who knows, and they usually find help faster than initially feared.

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https://www.instagram.com/11antgmxde/
https://www.linkedin.com/company/bauen-jetzt/

Especially considering you were born in 1983, so you’re no longer among the very youngest, and prices don’t stay the same—they tend to rise faster in the scale of house building than you can save against, and so on...

In the end, the type of block doesn’t matter. All houses will stand with it, and you won’t save enough on heating costs during your lifetime to offset the price difference between 42.5 Ytong and Poroton T9 blocks, let alone make a profit.

As mentioned before, the block is only one part of the thermal insulation puzzle. And even with KfW40 subsidies, it will still be more expensive than complying with the building energy regulation (Gebäudeenergiegesetz) without subsidies. And that’s sufficient—most people don’t need to cover the last 20% of the Pareto for their house.

If you sign a contract now, you’ll be living there in your mid-40s and finished by your late 50s... I would either start now or forget it.