ᐅ Is it feasible to achieve a KfW 70 energy efficiency standard using exterior masonry with 17.5 cm autoclaved aerated concrete (AAC) blocks, 16 cm mineral wool insulation, and a brick veneer?

Created on: 16 Feb 2015 18:17

Hello everyone,

I couldn’t find any useful information online, so I have a question.
Is it possible to meet the KfW standard with a new build wall construction consisting of 17.5 cm (7 inches) sand-lime brick / 16 cm (6 inches) glass wool / 4 cm (1.5 inches) air gap and facing brick? I know that for KfW 70 not only the wall structure matters but also the energy source, windows, etc. However, in principle, would this be feasible? I am looking for an alternative to Poroton, and sand-lime brick seems like a good option, especially considering sound insulation and fastening possibilities.

Thanks for your answers.

Best regards,
Stefan

derstefanm17 Feb 2015 07:21

[QUOTE="Lexmaul79

By the way, aerated concrete blocks are easier (lighter to handle) to work with for a mason 😉[/QUOTE]

Not only for the mason but also for the do-it-yourself builder. The recommendation was neither in favor of aerated concrete nor sand-lime bricks, but rather in favor of the Unipor blocks.
I generally have no issue with either, but in my opinion, sand-lime bricks offer additional advantages such as better sound insulation and fewer problems later when mounting something on the wall.

Sebastian7917 Feb 2015 07:24

Yes, that’s true as well (the advantages that people repeatedly mentioned to you in the other forum) – but surely you don’t want to build your house yourself, do you?

derstefanm17 Feb 2015 07:47

But I would like to do this with the help of a mason who can provide guidance. It would not be the first shell structure built in EL. The reinforced concrete work is handled by the general contractor.

Sebastian7917 Feb 2015 07:57

#10

Oh dear, good luck then...

derstefanm17 Feb 2015 08:03

#11

Thanks, I will have that...

Legurit22 Feb 2015 10:10

#12

So we are aiming for KfW 55 with the same wall construction – whether that is realistic, I don’t know. But I would hope that our planner would have intervened if that was completely off track.

ᐅ Is it feasible to achieve a KfW 70 energy efficiency standard using exterior masonry with 17.5 cm autoclaved aerated concrete (AAC) blocks, 16 cm mineral wool insulation, and a brick veneer?

Reaktionen