KfW 55 - Requirement - Not fulfilled - Consequence

Polystyrene is approved for food packaging and is also used there. What is this supposed to be about?

What exactly did you ask then?

You’re mixing up raw materials and synthesis products freely, following the motto "Atoms are toxic." But the world isn’t that simple, maybe you should reconsider your crusade against the Styrofoam league.

ok, Styrofoam as it is will not cause cancer. If you burn it, it's a different story. Since eventually the stuff becomes waste and it has been and is being used in large quantities, future generations will have a problem, possibly solvable for them in 60 years. But now it has to be produced, which is also not environmentally neutral. My point is that what you save in primary energy or CO2 in the step kfw 70 or energy saving regulation 55 or 40 is so little that the production and later disposal of the insulating materials cancels it out. What I suspect, don't know, but reasonably suspect. Because if we use 60 euros of gas per month in an energy saving regulation house monolithic without styrofoam and I could save, say, another 20% through insulation, that's 12 euros. That's not much anymore. ok.

Quickly googled. Same volume of construction debris vs. EPS disposal (5m³) 250€ vs. 100€. Hmn. It can't be that bad. Provided no HBCD or whatever it's called.

And I'll say it again, with increasing enthusiasm, 60€ gas for 110sqm (?) new building is _not_ good dear Karsten. I currently pay 120€ gas for 200sqm with a conservatory (from the 80s) that is heated continuously.

The buyer is obliged to prove compliance with the KfW 55 requirement after completion of the construction work by presenting an energy performance certificate.

That's quite a funny club. I want to see the energy certificate that confirms a KfW standard. Apparently, no expert was involved in drafting the contract. The demand energy certificate contains exactly two values: primary energy demand and final energy demand per m² of usable area. The KfW standard does not specify a fixed value but requires:

The primary energy demand must not exceed 55% of the demand of the reference building according to the Energy Saving Ordinance (2014 without tightening). The demand of the reference building results from a building equal in volume, orientation, and component surfaces to the object, constructed as specified in the Energy Saving Ordinance 2014.
The demand thus depends on the "shape" of the house. I can put a 5m wide, 12m long glass box or an 8m by 8m cube with loopholes – both KfW55 and both the same size. The consumption will differ by a factor of 2-3.

In addition, there are stricter requirements for heating technology and individual components compared to the Energy Saving Ordinance, which are not reflected in the energy certificate.

The word "energy performance certificate" is wrong here. It is about the thermal insulation certificate. Of course, it can show and prove the relation between the Energy Saving Ordinance and KFW 55.

In addition, there are stricter requirements for heating technology and individual components compared to the Energy Saving Ordinance, which are not reflected in the energy performance certificate.

Nope.