ᐅ Exterior wall without additional insulation

Hello forum community,

We are planning a new build.
The question concerns the exterior wall, as we are unsure whether the wall construction is truly sufficient.
The architect says that a 36.5 cm (14.4 inches) aerated concrete block without additional insulation would be completely adequate. (The building notice was still submitted last year.)
According to the architect, this would correspond to a KfW 75–80 standard house expressed in KfW terms.
We do not want an external thermal insulation composite system (ETICS), and brick veneer seems too expensive, plus we prefer the look of plaster/render.
Are our concerns unfounded, and can we trust the architect on this?

Best regards

Unauthorized.

That was easy ;-)

Regards, Bauexperte
Bauexperte

Hello,

we would like to join the discussion here. We are currently planning our single-family house and are considering different wall constructions. Basically, we want to build a monolithic wall, and therefore we are thinking about the following options:

a) 300mm (12 inches) aerated concrete with a lambda value of 0.09
b) 365mm (14 inches) T10 poroton blocks
c) not really preferred, but a combination of a) or b) with a mineral insulation

At the moment, we are leaning more towards option b) and are considering switching the block to a T9.

What do you think? Please be patient with us.

Best regards

Why not just use a thicker brick?
Neither 300 mm (12 inches) with 0.09 W/mK nor 365 mm (14 inches) with 0.1 W/mK are sufficient, in my opinion.

Enough for what? I assume you mean the energy saving ordinance reference value of 0.21, in which case the T9 would probably be the only option, or a 365 with aerated concrete, right?

Do the individual reference values according to the energy saving ordinance each have to be met? I can’t make sense of it.