ᐅ Poroton T12 bricks for exterior walls

Good evening,
Our construction company plans to build the exterior walls using an unfilled Poroton T12, 36.5 cm (14 inches) thick. The exterior plaster will consist of a lime-cement plaster between 1.5 and 2 cm (0.6 and 0.8 inches) thick, with a 2 mm (0.08 inch) synthetic resin plaster applied on top. The interior wall plaster will be a machine-applied gypsum plaster.
Is this sufficient for today’s standards? Or would it be better to choose a different Poroton brick?
Best regards, Micha

Not counting the plaster, this results in a U-value of 0.311.
I find it hard to believe that this will be sufficient. From T9 onwards, it becomes more realistic.
You can find the exact requirement in the thermal insulation certificate.

We are also building with T12 Poroton blocks inside and outside with a "mineral premium plaster."

If you still have the option to change, I would consider whether a filled T9 might be more suitable. Perhaps also from the perspective of sound insulation.
Plan T12 Z-17.1-877 unfilled: 42.8 dB
T9-P Z-17.1-674 filled: 46.6 dB

Higher dB attenuation = better

+10 dB = halving of the transmitted noise.

Unfortunately, I realized this too late...

guckuck2 schrieb:

Not including the plaster, this results in a U-value of 0.311.
I find it hard to believe that this will be sufficient. From T9 upwards, it becomes more realistic.
You can find the exact requirements in the thermal insulation certificate.

Exactly.
T12 is no longer up to date.
Filled bricks only make sense if there are increased sound insulation requirements.
From an energy efficiency perspective, the additional cost does not pay off.
S9 is the most economical option.

I need to revise my answer:

The most cost-effective type of brick is now the one filled with mineral wool, with a lambda value of 0.07.

That is not correct.