ᐅ Aerated concrete 42.5, thermal conductivity (lambda) 0.08 or 0.09 W/m·K

mini_g! schrieb:

So, you are in favor of aerated concrete for the exterior wall and calcium silicate brick on the inside?

My mistake, confusing terminology. It is actually an unfilled hollow brick that the local brick manufacturer calls Klimatherm PL8. Thermal conductivity 0.08.
That would correspond to the Schlagmann Poroton Planziegel-U8, I assume they are identical.

Best regards! mini

Aerated concrete is even worse than Poroton. It’s basically just air! Either calcium silicate brick with an external thermal insulation composite system (ETICS), or my choice would be a filled brick, preferably with perlite or alternatively mineral wool.

With unfilled bricks, you get strong structure-borne sound transmission inside the house, which is really significant. That is why this type of brick is considered unacceptable in multi-family buildings according to current technical standards. But even in single-family houses, you will be affected by it.

Bookstar schrieb:

Aerated concrete is even worse than Poroton. ... my choice would be a filled brick, preferably with perlite or alternatively with mineral wool.

Isn't Poroton the brick that is filled with perlite? Am I mixing something up here, or are you?

Bookstar schrieb:

With unfilled bricks, you have significant longitudinal sound transmission inside the house, which is really noticeable. That’s why this type of brick is “forbidden” in multi-family buildings according to current standards. But even in single-family homes, you get it all.

Longitudinal sound transmission – so you wouldn’t use unfilled bricks anymore (whether with perlite or mineral wool). Okay.

Bookstar schrieb:

With hollow bricks, you get significant structure-borne noise inside the house; it’s really quite intense. That’s why these bricks are "prohibited" in multi-family buildings according to current technical standards. But even in single-family homes, you still experience a lot of noise.

Aha(?), about two years ago a pretty large multi-family housing complex was built using hollow 42cm (17 inches) T9 bricks. I can only repeat that something must have gone seriously wrong if there are noise issues with Poroton. In a single-family home, most noise probably comes through door gaps and keyholes... assuming you even have doors, or that they are actually closed.

Lumpi_LE schrieb:

Aha(?), about 2 years ago a fairly large apartment complex was built using an unfilled 42cm (17 inches) T9 block. I can only repeat that something must have gone wrong if you have sound issues with Poroton. In a single-family house, most noise probably comes through the door gap and keyhole... if there are even doors, or if they are actually closed.

Then I feel sorry for those people. An unfilled block is a taboo in apartment buildings. Every technician should know this: the blocks are hollow inside and are usually bonded together. What happens to sound along the length? It passes through unhindered and is even amplified by resonance.

This has nothing to do with something going wrong, it’s just basic physics. Why do you think filled blocks were developed? Thermal insulation is not (much) better than unfilled blocks. It is purely about sound insulation.

Bookstar schrieb:

An unfilled block is a taboo in apartment buildings

An unfilled block is like an unfulfilled life. Joking aside, isn’t it the case with all other building materials that everything is connected? With calcium silicate blocks, do the blocks just float? Air doesn’t pass through freely either, since there is adhesive between them, and usually a floor slab between the stories.

By the way, aerated concrete blocks are solid and acoustically much worse than the porous clay blocks.

You are dissatisfied with your porous clay blocks, but your statements are not universally valid. The filled porous clay blocks were developed because the unfilled ones above T8 are more like a cookie than a block; the webs in the filled ones are simply much stronger.

Every building material has its pros and cons. If any had as poor qualities as you suggest here, people would build only with calcium silicate blocks or concrete.

For commercial construction, there are special S8-S10 Poroton bricks. These are always fully filled and have thicker webs to meet structural requirements.