How can one circumvent the Energy Saving Ordinance and avoid bureaucratic madness?

No, the wall temperature is usually always slightly above the outside temperature. The energy difference to the outside approaches infinity.

As a practical experiment to try: dip a light bulb into a cold bathtub. You can touch it and it is not warmer than the bathwater. If you wrap the light bulb in Styrofoam before dipping it into the bathtub, the Styrofoam is also not warmer or colder than the bathtub.

Are you currently assuming that you don’t heat at night?

In that case, you can also tell by the indoor air temperature. The house overall doesn’t cool down as much when it is insulated. The calculation for this was just posted. This should also cause the wall itself to cool down, which will certainly be noticeable in the WBK. However, heat bridges are supposed to be found (primarily). As far as I know, the heating is kept on for 48 hours to "warm everything up." This is when the heat bridges become clearly visible. It is also probably done in the morning to exclude any influences such as the sun.

Regards Joe

The OP is on a crusade here and only confuses with all sorts of nonsense. And the slide rules go along with it. Thermal images, natural stone, mornings and evenings, at night it’s colder than outside, the sun rises in the east.... And there are many birds by the lake. But the extension needs a building permit, and every architect or engineer will know what’s allowed and what’s not. Just like before, mortaring a few fieldstones and leaving a fire inside is no longer allowed. And a trapper’s log cabin is not allowed either. Whether that’s reasonable doesn’t matter; it is applicable law and must therefore be observed. Karsten

If you don't want an external thermal insulation composite system, then use a monolithic (single material) masonry. For example, we use a brick, a Poroton T8. It has a U-value of 0.21 W/m²*K at 36.5 cm thickness (which is the most common construction method here in Bavaria).

So the above example is by no means made up or hocus pocus.

Anything other than this simple fact that there is ALWAYS an energy balance only confuses you and is irrelevant here.

That sounds good. I will take a look at which types of bricks and Poroton are available on the market and examine their advantages and disadvantages.

Thank you!

By the way, when I say "natural stone," I mean a native product. That is, no chemical composition, no composite systems, etc... I will say "monolithic" in the future. (Although to me this sounds too general and also includes stones which—exaggeratedly speaking—consist of 1% monolith and the rest chemical. And I want to avoid that at the moment.)

Example: Suppose I have a house made of natural stone. We are now talking about one wall of it. It has no window and nothing!

This natural stone construction "insulates" the house according to the Energy Saving Ordinance, without additional insulation.
This wall is then warm/red in the evening and cold/blue during the day.

From a certain thickness: No!

You are making wrong basic assumptions. The natural stone wall only needs to be thick enough, then there is nothing red in the evening that was still blue in the morning.

Physically, this is due to the heat capacity. In winter, your warm indoor air has to warm up the wall. Compared to the wall, air has a very low heat capacity (calculated per volume). The wall has to absorb a multiple(!) of the energy that all the indoor air in the house has in order to even "reach temperature" (because of the high heat capacity).

This means that you can only achieve a temperature difference between the outside of the wall and the interior in winter with a long heating period and a high temperature difference between outside and inside. So no warm/red evenings.

The principle works in summer, when it is warmer outside than inside and vice versa, such a house stays cool for a long time. In winter, however, you also have colder walls inside than with other wall structures.

Such a masonry "consumes" energy, simply because it can absorb an enormous amount of it due to its high mass without immediately showing large temperature effects. Classic insulation materials are comparatively light (less mass) and simply have poor thermal conductivity, which is why they can achieve the same effect without absorbing much energy (and thus valuable heat).

The OP is on a crusade here and just confuses with all sorts of nonsense. And the slide rules go along with it. Thermal images, natural stone, morning and evening, at night it’s colder than outside, the sun rises in the east... And there are many birds at the lake. But the extension requires a building permit, and every architect or engineer will know what is allowed and what isn’t. Just like before, you can’t mortar a few field stones together and leave a fire inside anymore. And a trapper’s log cabin isn’t allowed either. Whether that’s reasonable or not doesn’t matter, it’s the applicable law and must be observed. Karsten

Hello Nordlys,

take it easy. Don’t get worked up.

I actually jump back and forth within the topic here because various users kindly respond to me. These different answers naturally lead to different threads. That does cause confusion. Sorry about that. But the topic is quite complex.

And sure, at the end of the day you go to the architect, pay, and that’s that. Personally, I at least want to have a basic understanding of the subject. I am currently in the process of gaining that.

And if you don’t understand something 100%, it’s common that the questions come across as confused.

By the way, statements like your last one absolutely don’t help. On the contrary. They contribute greatly to the confusion. But maybe that’s exactly what you want to achieve?