KFW40(plus) standard multifamily house cannot be achieved

Every component of the building corresponds to the U-value

Annual primary energy demand QP / QP,Anf is: 2.7 Reference Energy Saving Ordinance 41.22)kWh/(m²a)
Transmission heat loss H'T is: 0.192 Reference Energy Saving Ordinance 0.3523 W/(m²K)

And where exactly is your problem with a deviation of 0.0022? Just do a separate thermal bridge verification and that's it.

That's ridiculous. A few centimeters more perimeter insulation or a modern window profile and you're over the limit, if they can't calculate it smaller anymore.

You are unfortunately mistaken, the property is a double plot and is already built with a house from the 1950s and already in my possession, next to it there is still space of the specified size, since there is no development plan, the new buildings must be adapted in size to the existing buildings according to the building authority.

I am very pleased if I am wrong with my fears regarding you as a victim of real estate sales preachers. My doubts about the naivety of the concept remain (hopefully understandable). What do you want with a facing brick on a rental property in this housing size class? - it is not needed there, or relevant for turning a residential unit on the market faster - except maybe if we are talking about Bogenhausen or Sylt.

May I ask why one is supposed to achieve KfW 40 or 40+ with great effort and gray hair?
I know some tenants... and they all, without exception, can hardly make use of noisy ventilation systems and/or super insulated walls and/or these only underfloor heating systems. Then the window is tilted open all day and the ventilation is throttled...

Because it costs me only slightly more and thus g

I am very happy if I am wrong about my fears regarding you as a victim of real estate sales zealots. My doubts about the naivety of the concept remain (hopefully understandable). What do you want with a brick facade in a rental property of this apartment size? – it is not demanded there, nor relevant to quickly turn a housing unit offered on the market – except perhaps if we are talking about Bogenhausen or Sylt.

In our East Frisia region, this is the normal construction method; here, 95% of all houses are built in brick construction.

It's ridiculous. A few centimeters more perimeter insulation or a modern window profile and you're over the limit if they can't calculate it smaller anymore

I took the trouble today to download EVEBI as a demo version myself and indeed managed to do it, it's a razor's edge with a 0.03 thermal bridge surcharge, but it works.

Each component of the building corresponds to the U-value


Annual primary energy demand QP / QP,Anf is: 2.7 Reference Energy Saving Ordinance 41.22)kWh/(m²a)
Transmission heat loss H'T is: 0.192 Reference Energy Saving Ordinance 0.3523 W/(m²K)

Each component corresponds to which U-value? Does each component meet the kfw40 requirements according to the individual component method? Then great! Skip the Q and Ht' calculation and use the alternative method. I have already mentioned the source for information, you can also tell your energy consultant for the next house.

Otherwise, the solution for the little push has already been mentioned. But it’s also a crazy solution, instead of further inflating the walls, improve another component where there is even more potential.

PUR behind clinker is actually unnecessarily expensive. 8cm air gap is also 4 too many. Alternatively, you can use 032 mineral wool, which also allows you to go thinner.