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…

nordanney schrieb:
It’s going to be an interesting house. The original poster has spontaneously decided on the T9. And then an additional sheathing? An intriguing story.

Oh, that was just a quick remark from me earlier, part of my box of SCNR (Sorry, Could Not Resist) comebacks...

nordanney schrieb:
... at least until tomorrow when a new idea is found as the “miracle solution”...

... he’s not exactly someone who constantly looks for miracle solutions. However, we are in a forum focused not on philosophy (where I would fully understand if he enjoyed the process of searching and wandering), but on house construction (which is also his current motivation for being here). Here, he patiently receives one answer after another, and from me – including the repeated invitation to basically take the fast lane to my schedule – the encouragement to develop expertise, transforming from someone asking and searching into someone knowledgeable and solution-oriented, who can simply attach a ready-made solution to their specific individual project.

What I am doing here tirelessly is echoing Dieter Meier’s words after the Domingo de Santa Clara and explaining that the specialist knowledge required for building a house is no alchemy and no secret code; it’s just common sense; I myself attended a secondary school with a focus on classical languages. Two times two remains four from all perspectives, and for my house building plan, you don’t need to be a scholar. Thanks to forum searches with keywords like “@Gerddieter warns,” “self-contracted work/single contracts” or similar, anyone can be prepared and hardened in a weekend course against being fooled at pub talks, misled by salespeople, or taken advantage of. Yet some still sit like rabbits in front of snakes, oxen before mountains, or cows in front of new gates, believing old wives’ tales or waiting for Godot.

Is the issue with the original poster’s case related to origin (Sarajevo)? – we already have a similar long-term seeker here, who struggles to make progress (@prm2021, https://www.hausbau-forum.de/threads/grundriss-planung-2-vollgeschosse-ca-130-140-qm-ohne-keller.u4x6k8/). He also passionately remains stuck in one place and finds it hard to see the wood for the trees (or even grab them, despite virtually holding his hand). Sometimes I don’t understand it; mentality might be an explanation. I’m from the former East Germany – if you can’t do or know something, you go and find someone who does and usually find them with fewer detours 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.