Interior walls made of Poroton or calcium silicate brick?

Hi,

I have always heard as a basic rule that you should not mix materials. So if the exterior wall is Poroton, then the interior should be as well.

Inside, however, different bricks are used anyway, not the T9-14 that you use on the exterior wall, but rather the so-called hollow bricks. They have much more mass, and you can drill and plug normally. We have T14 as an exterior wall, where you need proper plugs (but still the regular ones) and must drill carefully. Our kitchen wall cabinets are hung on regular plugs in the exterior wall. No problems at all.

Important: be aware with Poroton that the unfilled ones have poor sound insulation compared to sand-lime bricks. With a T8 brick, you should ideally have very quiet neighbors.
We have a T14 and 16 cm WDVS on the outside, which, in my opinion, is borderline. If I were to build again today, I would either use all heavy Poroton hollow bricks or just sand-lime bricks.

Best regards,

Andreas

Otherwise, the entire brick will come towards you

Well, it’s not quite that bad, but still, one should definitely not use a hammer drill. Unfortunately, apparently very few craftsmen know this – or they simply don’t care because hammer drilling is of course faster. So in case of doubt, you have to watch out for it yourself.

I know that the search function here is not exactly great, but having a handful of interior wall threads every year is really not necessary. After all, everything has already been said at some point, sometime, sometime.

I have always heard as a basic rule that you shouldn't mix materials.

Basically yes, but the rule dates back to the time of small-format bricks that were thickly mortared instead of thinly glued (and where, by the way, the interior walls were still built in the same work step). Or as my late uncle Alex would have said: in the old days we had an emperor.

Don't drive yourself crazy about it!
I have a 75" TV including a 5kg wall mount hanging on an 11.5cm Poroton wall. Nothing happens!
I used completely normal dowels for it.

I didn't ask for more than that, but some people like to interpret too much. Thank you very much for sharing your experience with the 11.5cm Poroton with me.

We have KLB blocks on the outside and sand-lime bricks on the inside. Our construction company said it is for better sound insulation. I can confirm that we hardly hear anything with the doors closed. What really annoys me about sand-lime bricks is... you can't get a nail in!! I wanted to neatly nail our baseboards... every single nail breaks or bends. I tried everything! In the end, I glued everything, possibly drilled. Also, I have to attach every small decorative element or picture with a drill and anchor... You can simply hammer a nail into the KLB walls and the picture hangs. How is it with Poroton?

On the outside we have KLB blocks and on the inside sand-lime bricks. Our construction company said it was for better sound insulation. I can confirm that with closed doors you hardly hear anything. But what really annoys me about sand-lime bricks... you can't get a nail in!! I wanted to neatly nail our baseboards... every single nail breaks or bends. I've tried everything! In the end, I glued everything, possibly drilled holes. Also, I have to attach every small decorative element or picture with a drill and dowels... In the KLB walls, you can just hammer a nail in and the picture hangs. How is it with Poroton?

Thank you, this also helps me a lot with my decision-making.