Is energy efficiency worse at 36.5 stone?

Yep. We already discussed it at home

@ Lumpi

Thanks for the info

1) Ytong does not work easier, but faster, large blocks. 2) 36.5 is more than enough to meet the energy saving ordinance without styrofoam in front. 3) This wall is easier for you to use if you want to screw something onto it. 4) The sound insulation of Ytong is moderate. 5) Every BU has its standard wall structure. People know it by heart, there are good prices at the building materials trade, everyday communication works, therefore: whoever wants to build with Ytong/Porith/Hansapor etc. should look for someone who has that as a standard. 6) Where are you building? In the North there are masses of Ytong BU. It is an evangelical Prussian material, K.

1) Ytong does not process more easily, but faster, large blocks. 2) 36.5 is more than enough to meet the Energy Saving Ordinance requirements without polystyrene in front 3) This wall is easier for you to use if you want to screw something onto it. 4) The sound insulation of Ytong is moderate 5) Every construction company has its standard wall structure. People know it by heart, you get good prices in the building materials trade, everyday communication works, therefore: whoever wants to build with Ytong/Porith/Hansapor etc. should find someone who has that as a standard. 6) Where are you building? In the north there are masses of Ytong construction companies. It is a Protestant Prussian material, K.

Regarding 4.) Yes, I have already read that, but if the exterior walls are made of Ytong and the interior walls of calcium silicate brick, the sound insulation should be better?!? Regarding 6.) Saxony-Anhalt So more central in Germany

If stone and builder do not match, you have to decide whether the stone or the builder is more important to you. Try not to re-educate the builder; he only "masters" "his" material well enough.

Even though I personally belong to the monolithic faction, I still think it's good if you are open to both wall constructions. So if

There we said that we would like a 365 stone

only means that sympathetic and/or reasonably assessed people have advised you to do so, then don't get stuck on it and take the builder with whom the "chemistry" fits and build with him the way he knows best.

No matter how many different stones the building materials trade also has - the philosopher's stone is still not in the assortment, unfortunately Columbus only optimized the egg. But millions of houses have already been built from imperfect materials in absolutely sufficient quality.

that aerated concrete is easier to work with than Poroton,

"Different" would be more accurate, but you don't have to care because aerated concrete is only more suitable for the do-it-yourself mason than porous bricks.

all right! Thanks =)

we had a conversation with a general contractor yesterday. There we said that we would like a 365 stone (Ytong or Poroton)

which is why he might have thought that energy efficiency was very important to you

The answer came immediately: He doesn’t think much of that, 24 with 12mm Styrofoam is much better than the 36.5

which is basically not wrong:

U-values according to Ubakus.de:

36.5 Ytong: 0.26
36.5 Poroton: 0.21
24 Ytong + 12WDVS: 0.18
24 Poroton + 12WDVS: 0.16

He also said that the energy efficiency would drop from A (+) to D?!

you can’t say that in general without knowing the heating type etc., but A+ is of course easily achievable with 24 Poroton and 12cm WDVS, while with a poor (heavy/cheap) 36.5 Y-ton you would probably have to be satisfied in the D range. This all doesn’t sound unrealistic (U-values above calculated with a medium-density Ytong)

I’m slowly starting to not know what to believe anymore.. Everyone tells something different. What do the experts here say?

That is normal in construction: ask 5 people and you get 10 opinions. Everyone naturally knows it exactly and everyone else has no clue.

Before you worry about the wall structure, you should define your requirements for the wall structure:

should it be: as soundproof as possible, as cheap as possible, as thin as possible, as breathable as possible, as thermally insulating as possible, ...? Or a combination of these goals?

From that, you can then find the ideal wall structure for you!

- monolithic 36.5 Ytong e.g. would not be very soundproof, moderately insulating, rather cheap, average thickness and well breathable
- monolithic 36.5 Poroton moderately soundproof, well insulating, somewhat more expensive... etc.
- ... etc.