ᐅ Aerated concrete or calcium silicate masonry with external wall insulation system (EWIS) using polystyrene foam

Since insulation does not affect the air exchange of a modern house, your choice has no impact on issues like mold and moisture problems inside. These are always matters of proper ventilation in airtight houses, which are legally required everywhere.

If someone believes they are doing something good for the environment by choosing mineral wool instead of EPS, that is possible. However, it does not change the fact that the house is airtight per se, nor does it affect mold or other issues inside. As for durability, both options will last far longer than you will. I could again refer to the Fraunhofer study, which found no signs of material degradation in external insulation systems on 40-year-old buildings—none at all! The material probably lasts even longer than the masonry behind it.

CoolCat schrieb:

We might soon face a similar decision.

Our preferred option offers insulation for the sand-lime brick in alternatives to polystyrene, such as mineral wool or wood-based insulation – with increasing additional costs.

Insulation with mineral wool, etc., is more expensive for us than aerated concrete (Ytong). Therefore, in that case, we would build monolithically.

Use sand-lime bricks combined with polystyrene. When properly installed, this system provides decades of reliable performance without health concerns and offers improved sound insulation.

I don’t want to clutter the thread, but is it really as described?

In other words, is the claim about the greater durability and indoor climate benefits of mineral wool insulation not accurate?
If so, then it’s not worth the money.

Do you also believe that Nimm 2 is full of good vitamins, or that children’s chocolate is healthy because of the extra milk? At least, that’s what the advertising says.

How is mineral wool supposed to change the indoor climate? There is no direct contact with the interior, nor does it affect air exchange.

Durability... No idea, but EPS will outlast you... Even if mineral wool lasts 200 years instead of 100 years... (I have no clue…)... What’s the advantage?

I look at the features and question them.
Especially in the construction sector, there are various philosophies and preferences, so as a layperson, you initially only take in information on a trial basis.

For me as a layperson, Styrofoam simply seems more sealed than mineral wool, but I rely on personal experience in my areas of expertise.