Exterior walls Poroton T9 vs T14 plus external insulation

Hello everyone,

we had an initial conversation with a general contractor regarding the construction of a single-family house. He said that the exterior walls will be built with Poroton T14 (24cm) plus external insulation. When I asked about Poroton T9 (36.5cm) without insulation, he said that the T9 is not as good as the T14 in terms of structural stability. Furthermore, when using the T9, a "mesh" must be applied around the masonry to ensure proper structural stability.

I am a layman regarding bricks, but due to the thickness (24cm vs. 36.5cm), I actually thought that the "thicker" brick would also be better in terms of structural stability.

Can someone clarify this for me?
Which value stands for "good structural stability" in bricks? Bulk density class? Compressive strength class?

Hi,

I am also a layperson. The T9 in 36.5 cm has very thin webs and many air chambers. Therefore probably somewhat more brittle. I cannot understand the thing with the mesh. At least here the ceiling will be concreted next week and that without any meshes. Many GÜ have their favorites; if you want 36.5, I would look for another GÜ.

In response to my inquiry about Poroton T9 (36.5) without insulation, he said that the T9 is not as good statically as a T14. In addition, when using the T9, you have to put a "net" around the masonry to make the statics work.

We have been building, among other things, quite a long time with 36.5 Poroton; a "net" – whatever that is supposed to mean – we have not yet placed around our masonry.

Rhenish regards

Thank you for the answers. I will ask again what the "Netz" was about...

Perhaps he meant the mesh net, which some shell builders apparently place between the Poroton brick layers. This is part of the entire "stones, mortar all-inclusive package" from Wienerberger. It is supposed to prevent cracking but seems to be very controversial. Many greetings, Andreas

And as for the statics: The T9 stone only has very delicate webs and the raw material also has a lower density. Therefore, the T9 also shows 36 cm less compressive strength than the T14 in 24 cm. The T14 in 24 cm will also have better thermal insulation together with the [WDVS] than the T9. Best regards, Andreas