Hello dear forum,
I am in the process of renovating an old wooden house and would like to take advantage of the funding opportunities for energy-efficient refurbishments from KFW/BaFa. I have already hired an energy consultant and am trying to determine with them which requirements I need to meet. Unfortunately, I am not very satisfied with working with this energy consultant because it is very difficult to get the necessary information from them. Therefore, I am turning to this community in the hope that someone can assist me.
Specifically, my question is as follows: The energy consultant told me that—regardless of the efficiency house standard—there is always a certain minimum insulation thickness that must be met. As an example, they said the roof insulation always needs to be 280mm (11 inches) thick—regardless of the type and quality of the insulation material used.
In my case, there is an external rafter insulation of 60mm (2.4 inches). Therefore, I would need to add 220mm (8.7 inches) of insulation material for the insulation to be eligible for funding. However, in all the information I have found, there is no mention of a minimum insulation thickness, but only references to the U-value of the building component, which varies depending on the materials used and, of course, the thickness, resulting in different calculated values.
Can anyone confirm or dispute that these minimum thicknesses exist, where they are specified, and how the minimum thickness correlates with the minimum U-value requirement (0.24 W/m²K)?
Furthermore, I have another question: I have heard that for buildings constructed in 1982, the Building Energy Act (Gebäudeenergiegesetz) does not apply. Is this correct, and would this result in different limits for funding eligibility?
Thank you very much for your help!
I am in the process of renovating an old wooden house and would like to take advantage of the funding opportunities for energy-efficient refurbishments from KFW/BaFa. I have already hired an energy consultant and am trying to determine with them which requirements I need to meet. Unfortunately, I am not very satisfied with working with this energy consultant because it is very difficult to get the necessary information from them. Therefore, I am turning to this community in the hope that someone can assist me.
Specifically, my question is as follows: The energy consultant told me that—regardless of the efficiency house standard—there is always a certain minimum insulation thickness that must be met. As an example, they said the roof insulation always needs to be 280mm (11 inches) thick—regardless of the type and quality of the insulation material used.
In my case, there is an external rafter insulation of 60mm (2.4 inches). Therefore, I would need to add 220mm (8.7 inches) of insulation material for the insulation to be eligible for funding. However, in all the information I have found, there is no mention of a minimum insulation thickness, but only references to the U-value of the building component, which varies depending on the materials used and, of course, the thickness, resulting in different calculated values.
Can anyone confirm or dispute that these minimum thicknesses exist, where they are specified, and how the minimum thickness correlates with the minimum U-value requirement (0.24 W/m²K)?
Furthermore, I have another question: I have heard that for buildings constructed in 1982, the Building Energy Act (Gebäudeenergiegesetz) does not apply. Is this correct, and would this result in different limits for funding eligibility?
Thank you very much for your help!
B
Benutzer20030 Nov 2021 20:07maverix! schrieb:
As an example, he told me that roof insulation always has to be 280mm (11 inches) thick—regardless of the type and quality of the insulation material used.Nonsense. In university, the law professor always asked nicely, “Where does it say that?” You should ask that question too. I achieve the required U-values for the 55 renovation standard house using a variety of materials with different thicknesses (which makes sense—the mineral wool 035 on the top floor ceiling has to be 24cm (9.5 inches) thick, while under the basement ceiling, 10cm (4 inches) of PUR 022/023 is sufficient). maverix! schrieb:
Additionally, I have another question: I heard that the Building Energy Act does not apply to buildings from 1982. Is that correct, and would this result in different limits for funding eligibility?What counts is the current situation. It doesn’t matter how old the house is. If you want funding, you have to meet the criteria set today by KfW. It’s that simple.P
pagoni202030 Nov 2021 22:10You need to achieve the calculated insulation value; there is no fixed standard as a requirement.
We have changed this several times due to material shortages, and each time the corresponding insulation value of the material was checked and adjusted.
What do you mean by "there is"? Is it already installed, and what material is it?
Maybe it still makes sense to insulate the roof more thoroughly. In the end, the energy consultant adjusts various factors to meet the required value, such as windows, insulation, etc.
However, it seems to me that you might want to consider consulting a different energy consultant.
We have changed this several times due to material shortages, and each time the corresponding insulation value of the material was checked and adjusted.
maverix! schrieb:
In my case, there is an additional over-rafter insulation of 60mm (2.4 inches). Therefore, I would need to add 220mm (8.7 inches) of insulation material for the insulation to qualify for funding.
What do you mean by "there is"? Is it already installed, and what material is it?
Maybe it still makes sense to insulate the roof more thoroughly. In the end, the energy consultant adjusts various factors to meet the required value, such as windows, insulation, etc.
However, it seems to me that you might want to consider consulting a different energy consultant.
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