ᐅ Building according to the Building Energy Act or EH55 or EH40 standards

I have just read a study on the life cycle costs of a 12-unit residential building.

Alarming!

The cost per ton of CO2 saved was more than three times higher for the standard EH40 compared to the building energy regulation / building code.

Although this study focuses on a multi-family building, it could, to some extent, also be applicable to a single-family house.

According to the study, especially higher costs for maintenance, repairs, and component replacement negatively affected the economic efficiency.

Cost per ton of CO2 saved
Building energy regulation / building code: 2,171 €
EH55: 4,718 €
EH40: 7,523 €

Vilfredo Pareto recognized more than 100 years ago that the last 20% can only be achieved with 80% of the total effort. This principle also seems to apply to the energy efficiency of houses.

By now, this question is only partly relevant since the building energy law now corresponds to EH55. However, I personally don’t understand where the high costs are supposed to come from. The thicker bricks aren’t significantly more expensive and don’t require maintenance either. The only difference between the old EH70/building energy law and EH40 should be better windows (although both eventually age) and the controlled ventilation system. Roughly estimated, one ton of CO2 equals about 2000 kWh of electricity, so you would have to pay nearly 5500€ in maintenance costs every year?

Allthewayup schrieb:

that the last 20% can only be achieved with 80% of the total effort. This principle apparently also applies to the energy efficiency of houses.

We don’t even get out of the 20/80 yet.
That is already lost during construction.
Maintenance and servicing account for over 40% additional costs from the building energy law to EH40.

Google
Life cycle costs multifamily house with media

Just finished.

Here I stand, poor fool,
And I’m no wiser than before!
Because a number is simply thrown out there without any concrete justification. This also contradicts my experience from construction practice, since which part is supposed to require higher maintenance? Walls? Windows? Ventilation?

By the process of elimination, only the ventilation remains. However, according to building energy regulations, you do not necessarily build without it (not even in residential construction, otherwise you will have noise complaints due to mold after a few years). And for the 8,000 kWh (approximately 2,500 USD) saved per year, you could replace the fans in the apartment building in rotation.