Cost difference between KSK+WDVS and aerated concrete

Especially with you in Niederlehme, the oldest sand-lime brick factory is located. Just ask there directly if they can name companies to which they deliver a lot.

Hello,

Of course... but apart from giving up the additional insulation, there is little in favor of aerated concrete. Especially since our building plot is limited, so when building with aerated concrete we would lose about 20 cm of room size on each side.

Just for the sake of completeness – I really don't care which building material you want to use – because your calculation doesn't make sense to me. 17.5 + 14.0 equals 31.5 cm for me – a difference to 36.5 of just 5 cm all around. How do you come to 20 cm per side?

With triple-glazed windows and a gas condensing boiler, a KfW 70 house ...

I strongly doubt that...

Rhenish regards

I would classify it at first glance as an energy saving regulation.

Just for the sake of completeness - I really don't care which building material you want to use - because your calculation doesn't make sense to me. 17.5 + 14.0 equals 31.5 cm to me - in difference to 36.5 that's only about 5 cm all around. So how do you come to 20 cm/side?

True...here I made a mistake in thinking...it's probably 20 cm spread over all 4 walls...

I strongly doubt that ...

Here I must shamefully admit that I have not yet dealt with all these KfW standards.

The ex-boyfriend of my current partner built a house with the same architect 4 years ago, using the same masonry. Only, instead of gas condensing boiler, he went for geothermal energy with surface collectors. He achieved the KfW 55 standard, I know that 100% this time.

So we have two pretty much identical buildings...only the type of heating differs here. Both houses, from my understanding, retain heat equally well...only that I will probably have higher heating costs in the long run. Now I assumed that with a gas boiler we would reach KfW 70. Whether that is really the case...?

Unfortunately, our budget did not allow for a geothermal heat pump with probe drilling (surface collector not possible).

As I said, you may well be right here too...?

Right there in Niederlehme is the oldest sand-lime brick factory. Just ask them directly if they can name companies they supply a lot to.

Niederlehme is still 120 km north of us... so really South Brandenburg

But I still didn't know that... thanks for the tip.

However, the "KfW standards" always depend on the underlying, currently valid energy saving ordinance - KfW70 of today is significantly more demanding than KfW70 from 10 years ago.