Steinfrage => Summer Thermal Insulation

Ytongg is a manufacturer - primarily aerated concrete, which is not filled ;).

KFW values are always an overall interplay of various factors - not always just focusing on the exterior masonry, which we see here (energetically currently rather poor masonry).

That is why my explicit reference to the masonry. Because currently people only talk about the values of the stone regarding KFW70/55. :)

Yes, the Poroton is filled with perlite between the chambers. Unfortunately, I don’t know the prices yet or how far that is from Ytongg with aerated concrete or e.g. calcium silicate brick with mineral wool.

I also assume that you can achieve the KFW70 standard with any of these bricks.. it just depends on the rest around it.

We have also planned a central ventilation...
Regarding the WDVS issue, many always say that the exterior walls turn green. Allegedly due to the temperature differences between Styrofoam and plaster?!

How is the KS + WDVS for the indoor climate, or does it not matter if you have a central ventilation?

There is no jack of all trades. Everything has its advantages and disadvantages, whereby in the premium segment, in my experience, things are rather built monolithically.

Ultimately, many builders start with extensive research on the stone and end up realizing that this is probably better discussed with the architect and structural engineer, who also carry out the corresponding calculations.

My very personal opinion is that when I knock on the facade, it sounds like how a high-quality house should sound to me ;-)

Indoor climate is always the same (musty) if you don't air out ;-)
KS has a kind of buffering effect - it takes a lot of energy to warm up.
What is built also always depends on the region... with us mostly double-layered.

We built with Ytongg and moved in before the heat period this summer. Our house stands free. Each side is exposed to sunlight during the day. Our ventilation is decentralized and controlled according to the position of the sun and temperature. Shutters were partially down and partially not. Temperature on the ground floor: constantly 21 degrees. On the upper floor: 22 degrees, rising to 24 degrees during peak heat times over several hot days.

Musty .... No!

We are very satisfied so far.

did you add facing bricks or leave it as in the picture? Were 36 cm Ytong blocks used, or which ones? The temperature values definitely sound very good. But of course, that is also a result of the combination of everything. Still interesting :)