Solid house: Which stone / brick?

For the builder who now has no special requirements and just wants to have a "reasonable" little house built, the choice should depend more on the price/performance ratio, regional factors, and above all the craftsman.

By price/performance you certainly mean performance as the U-value, right?

...but we can also point the OP to the breathability and diffusion openness of different materials to confuse him even more.

Sure, bring it on, you can never read too much before deciding on a particular brick, I think.

Yes, fundamentally the question is whether an insulating material (perlite or mineral wool) settles over the years and thus insulates worse at the upper edge of the brick or not.

do you mean mineral wool or also the perlite bricks by cream slices? Why don't you think much of them? They logically have a better insulation value / U-value than chambers filled only with air, as were installed exclusively several years ago.

Even if the mineral wool could theoretically settle, this should not really be a problem in practice?! Keyword: air gap anchors. They not only hold the brickwork but also the mineral wool. Besides, a lot of water would have to get in first, which the air gap also protects against to some extent.

Even if the mineral wool could theoretically sag, this should not really be a problem in practice?! Keyword: cavity wall anchors. They not only hold the brickwork but also the mineral wool. Besides, a lot of water would first have to get in, which the cavity also somewhat protects against.

I did not know cavity wall anchors and had to duckduckgo the word first. They are used in external insulation, if I interpret it correctly? Here it is about the mineral wool installed in the air chambers of the bricks of the Unipor type.

Even if the mineral wool can theoretically settle, this should not really be a problem in practice?!

The insulating effect is gone when the insulation wool is wet and, above all, remains wet. It doesn't matter whether it is still spread out against the masonry or not.

by price/performance you probably mean the U-value, right?

That depends on your requirements; most people initially understand that as the insulation value. But soundproofing, structural stability (rarely the case with single-family homes), etc. can also play a role.
Maybe first think about where you want to go. Meeting the Energy Saving Ordinance, KFW55, Passive House? What is important to you in this regard: ecology, cost-effectiveness?

If you want to build monolithically, the higher you want to go, the more 36.5 bricks won't suffice or you may have to dig very deep into your pockets depending on the case.
Always remember, the brick is only one factor among many. Roof construction, base plate or basement insulation, windows, etc. It’s an interaction.
As I said, if you’re not too stuck on a system because you want something very specific, I wouldn’t nail myself down to anything. And if the contractor you like, B, mostly builds with brick S and S also fits a reasonable price range for you... then I wouldn’t get too worked up about it.

Sure, bring it on, you can never read too much before deciding on a certain brick, I think.

That wasn't quite meant seriously. These are more like sales myths, but if you want to hear a few more:

- Nothing lifts in aerated concrete and the sound insulation is very poor because it has no mass anyway.

- Unfilled bricks with small bridges are crumbly biscuits. Everything breaks and nothing lifts.

- Filled bricks have such large hollow spaces that nothing lifts.

- Bricks with perlite leak everything out.

- Bricks with insulation wool settle, cannot be kept dry during construction, so no insulation effect and therefore almost everyone who has built with them also has significantly higher heating costs afterward.

- Bricks are bad anyway because they are not breathable. Prefabricated houses with wooden studs diffuse, breathe actively, regulate moisture and intestinal gases independently.

- Bricks diffuse. Because they are a natural product.

- ETICS (External Thermal Insulation Composite Systems) are hazardous waste.

- Woodpeckers nest in ETICS.

... oh, there are a few more of those.

I am currently considering using insulated bricks with mineral wool, but I am afraid of mold growth. Do you have an opinion on this?