ETICS, exterior wall, insulation, energy experts' experience reports

Would it still be possible to explain the advantage / disadvantage of a thicker wall in exchange for less WDVS ..

...Now I would only be interested in what kind of building envelope should be aimed for? The 24 cm + 16 cm ETICS planned for me is, in my opinion, a bit less stone and too much insulation.

...Would it still be possible to explain the advantage / disadvantage of a thicker wall with less ETICS in return?..

Hello,


In conventional house construction, you have to spend a good €20,000-25,000 more to realize a KfW 55 efficiency house. This extra cost is made up of thicker masonry, stronger insulation, and a lot more technology. So the question of cost-benefit ratio arises – as €uro probably means.

I have often debated this with our structural engineer, and we largely agree that the preprogrammed focus on the KfW should not be the be-all and end-all. If a single-family house is built according to today’s valid technology and guidelines, it is by no means a bad house; important is that the outer shell should correspond to the values of a KfW 70 efficiency house.

The insulation and technology craze demanded from Brussels is a tricky matter; after all, the ladies and gentlemen there do not pay the bill The lower the targeted end goal – here for example KfW 55 – the more money has to be invested, and therefore not only should the question of amortization of the required funds be questioned, but also personally, whether 1 or 2 percentage points of cheaper money are really worth all this technical madness. Is a house built analogously to the valid Energy Saving Ordinance really worse?

Therefore, I always recommend to our customers to adapt the outer shell including glazing to the KfW 70 specifications (without ETICS). Gladly to use renewable technology – where possible a ground source heat pump, alternatively an air-water heat pump, and definitely to install a ventilation system. With these measures, a solid and durable single-family house can be realized, whose future residents will not have the feeling of living in a technology-heavy plastic shell.

In the coming years, many new technologies will conquer the market, ranging from small wind turbines for the roof to storable modules for electricity. When we have reached this point – and the above recommendations were taken into account during construction – a self-sufficient functioning house can be realized retrospectively. I am sure that then there will be plenty of subsidies to apply for again and – what might be even more important: at that time the private purse will have recovered from the efforts of today’s new builds.

Kind regards

..I consider supporting the hype around the PH or KFW 55 as the sole future-oriented construction method to be exaggerated or not always feasible.

Hello,
Extremes are rarely actually sensible. The real truth usually lies somewhere in between.
It is not difficult at all to find it if you have previously determined the actual demand (power, energy) for heating, DHW, and possibly ventilation.
It is always the overall context of the individual construction project that is decisive, not sporadically picked out details, such as the insulation value of an AW.

best regards.