ᐅ Masonry using Ytong blocks, 24 cm or 30 cm thick, for a single-family house?

Created on: 20 Aug 2019 20:45
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Ruska
Hello building experts,

It looks like construction can start soon. I was convinced by the regional TuC partner regarding the overall concept because of the monolithic construction method.
In the "basic package," the masonry is made from 24cm (9.5 inches) Ytong blocks. Does anyone have practical experience with thermal and sound insulation? The residential location is very quiet, traffic-calmed, and has almost no through traffic.
Alternatively, I am considering a build with 30cm (12 inches) blocks; I still need to find out the additional cost.

Best regards,
Ruska
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Yosan
20 Aug 2019 23:06
Oh, I see... The additional cost for 36.5cm (14 inches) walls would have been at least 10,000 Euros. It involves more than just the wall material itself (for example, a larger foundation slab to maintain the same living area, and of course a somewhat larger roof, etc.).
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guckuck2
21 Aug 2019 07:09
Nordlys schrieb:

TundC wants to achieve all this with 24cm (9.5 inches) as well? It's unclear how that would work. Ask them, the 30cm (12 inches) option is a good choice, I tell you.

So with 30cm (12 inches) aerated concrete, you can reach “KfW 60,” but with 24cm (9.5 inches) it’s questionable whether the energy saving regulations are met? I see.

Insulation thickness or wall thickness for insulation purposes is a calculation and nothing else.
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Nordlys
21 Aug 2019 08:02
Nothing like that. It was calculated by an engineer from Flensburg. I have the calculation.
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guckuck2
21 Aug 2019 08:35
And are the 24cm (9.5 inches) from TuC made up? Or do they perhaps follow the same calculation method?
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Mottenhausen
21 Aug 2019 09:22
@Nordlys, the point is that you cannot on one hand question whether 24cm (9.4 inches) Y-ton blocks are sufficient to meet the energy-saving regulations, and on the other hand claim that your additional 6cm (2.4 inches) is enough to achieve an imaginary KfW60 standard.
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Mottenhausen
21 Aug 2019 09:33
Nordlys schrieb:

Burglary protection? Sure, you can break through the wall if you drive a Unimog into it.

I think he means: windows screwed into the Y-ton can be pushed in completely along with the frame and screws, causing less noise than smashing the glass.