Hello,
we are planning to build a single-family house this summer. Now we are reviewing whether it is economically viable for us to achieve KfW-55 standards. Starting from April 1st, the simplified verification method based on reference values is sufficient for KfW funding.
Does it even make sense to use the simplified verification method, or is it easier to achieve the requirements with the standard calculation?
For windows and other transparent elements, a Uw value below 0.90 W/(m²·K) is required. Am I correct in understanding that this also applies to roof windows? So far, I haven’t found any information regarding this area.
Thank you
Cheers Tentakel
we are planning to build a single-family house this summer. Now we are reviewing whether it is economically viable for us to achieve KfW-55 standards. Starting from April 1st, the simplified verification method based on reference values is sufficient for KfW funding.
Does it even make sense to use the simplified verification method, or is it easier to achieve the requirements with the standard calculation?
For windows and other transparent elements, a Uw value below 0.90 W/(m²·K) is required. Am I correct in understanding that this also applies to roof windows? So far, I haven’t found any information regarding this area.
Thank you
Cheers Tentakel
The question can basically only be answered in connection with a specific building design.
In the simplified procedure, the U-values of the heat-transferring exterior components are prescribed. In the full verification procedure, which involves a complex calculation process, the building components can be related and balanced against each other. The overall balance must meet the values specified by the Energy Saving Ordinance or the KfW funding programs. For the design of the shell structure, the planner is therefore potentially more flexible with the full procedure and can compensate for disadvantages in one area by using higher insulation in another.
The simplified thermal bridge verification according to form sheet D is also associated with design requirements and restrictions that may adversely affect the design.
Whether you want to follow the specifications of the building services system with the planned system packages is a decision you need to make yourselves.
Basically, every structural engineer who is also listed in the dena database as a building energy consultant / energy efficiency expert already provides the full verification with their thermal protection proof, as they have the necessary calculation software approved by BAFA for this purpose.
These options should ideally be discussed right at the beginning of the collaboration with the architect and structural engineer. I recommend the complete verification procedure and the greater design freedom it offers.
In the simplified procedure, the U-values of the heat-transferring exterior components are prescribed. In the full verification procedure, which involves a complex calculation process, the building components can be related and balanced against each other. The overall balance must meet the values specified by the Energy Saving Ordinance or the KfW funding programs. For the design of the shell structure, the planner is therefore potentially more flexible with the full procedure and can compensate for disadvantages in one area by using higher insulation in another.
The simplified thermal bridge verification according to form sheet D is also associated with design requirements and restrictions that may adversely affect the design.
Whether you want to follow the specifications of the building services system with the planned system packages is a decision you need to make yourselves.
Basically, every structural engineer who is also listed in the dena database as a building energy consultant / energy efficiency expert already provides the full verification with their thermal protection proof, as they have the necessary calculation software approved by BAFA for this purpose.
These options should ideally be discussed right at the beginning of the collaboration with the architect and structural engineer. I recommend the complete verification procedure and the greater design freedom it offers.
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