Is insulation worth it beyond the new construction standard?

And why should the gloss be gone? How do you come to that conclusion? I know enough houses with 20-year-old windows that still look very good both outside and inside...

The materials are also becoming more UV-stable (at least that is how it is advertised), meaning it is to be expected that they will become even more durable.

On the question of insulation

In the 70s, more than 80 mm of glass wool was already not worthwhile.
In addition, a high-temperature boiler. These are still particularly value-stable buildings today.

The wishes and possibilities are very individual.
I think that features such as insulation take priority over features such as a kitchen that can be changed later.

Olli

It’s not only about the time after which windows are replaced or should be replaced, but also about the type of windows, the manufacturer, etc. However, I agree with the statement of my predecessors that when installing windows, you should save the least on insulation. With really good windows, the price difference can be several hundred euros, especially when it comes to installing roof windows, which can vary greatly depending on the type (pivoting, frame, etc.). But if everything looks financially good for you overall, I would always try to install the maximum insulation in a new building... it can only be beneficial, at least when it comes to insulation. Depending on the location (aircraft noise, etc.), it also matters whether you use double or triple glazing.

I would place great value on floor insulation, masonry, and the roof. I am building before my 30th year of life and would like to live there until I am 70-80 years old. As long as possible. Triple glazing may not insulate perfectly in 30 years, but no one can take the masonry away. If the house already stands well without [WDVS], there is still room for improvement. You never know what will come in the long term. I would feel more comfortable initially relying on an inexpensive gas condensing boiler, and using the remaining available resources for the rest.

What is supposed to come in the long term? Insulation values do not change - what keeps warm enough today will also keep warm in 30 years.

And the insulation curve changes just as little - no matter how much more you add, the effects remain minimal beyond a certain point.

But somehow some people just don't want to understand that...

He probably meant the also in my opinion unfounded fear that the kWh might cost 2.00 EUR in 30 years or something like that. I am more inclined to believe that energy prices will long-term decrease again. Nobody would have thought in the past that you could produce electricity with photovoltaics for 10 cents and with wind power for 5 cents. I predict "Peak Energy Price" – something new alongside Peak Oil.

If energy really became extremely expensive, then every house would probably HAVE to be converted to passive house standard.

On the other hand, friends of ours just renovated an old building and certainly have no money to invest in further optimization in the next 30 years (note: old building renovation is more expensive than new construction). According to the energy saving ordinance certificate, they have about 100 kWh per m2 and year. When you look at something like that and then at real old buildings that will still stand for many years, you shouldn’t worry about a current house built according to the energy saving ordinance new building guidelines.

btw: 80 percent of households here in DE heat with gas. That will not change quickly either; in the future, at most, the share of wind gas and biogas will increase. In my opinion, there is nothing against a gas boiler and if it was the wrong horse after all, then it was a 1,500 EUR bad investment. Written off and move on (provided a floor heating system suitable for a heat pump has been planned).