Does an aerated concrete block (36.5) require additional insulation?

We want to build a two-story detached house. Our architect suggested a 24 cm aerated concrete block, which he plans to insulate with 10 cm of styrofoam and ordinary plaster. We would prefer to have the plaster applied directly to the masonry, but we are not sure whether, for example, a 36.5 cm aerated concrete block alone is sufficient to meet the energy saving ordinance. Would we achieve the same insulation effect with that as with a 24 cm block with styrofoam?

Hello Camper,
it is certainly possible to meet all energy-saving ordinance requirements with aerated concrete blocks without insulation. In my opinion, it would be redundant anyway to insulate a highly insulating (but poorly soundproofing) thin aerated concrete block again.

Gas concrete and aerated concrete are the same; the blocks are white and have a porous surface all around.
Porous bricks (known under the brand name "Poroton") are red and the visible surfaces are rather smooth, the blocks have high-hole chambers.
Aerated concrete and porous bricks are often confused, therefore this final explanation.

This aerated concrete is sufficient and additional insulation is not necessary. It does have good thermal insulation. What is moderate, however, is the sound insulation.

Masonry made of aerated concrete offers good insulation from the very first centimeter. It has excellent thermal properties. The disadvantage is poor sound insulation. However, a new decision must be made for each object.

Definitely no insulation with aerated concrete blocks. But I am also satisfied with the soundproofing and have nothing negative to say. I always like to build with these blocks.

With aerated concrete blocks, the insulation is embedded in the block. Therefore, there are fewer dew point drops on the plaster. However, it is also important to incorporate [Wohnraumbelüftung]. Everything must be well controlled to prevent mold from developing.

That is already a good thing.