Hello everyone,
maybe one of you can help me. My energy consultant needs a document from my window manufacturer about the Uw value of the windows (standard windows), which should be about 1.20m x 1.48m (4 feet x 4 feet 10 inches), as far as I understand.
What does such a document look like, or does anyone have one available so I can use it as a template for my window manufacturer? He is not exactly sure what it should look like and said he has never had to provide such a document before. I am building a KfW 40 house and need to have this document.
It should probably state that the windows were installed according to RAL standards and include the Uw value of the windows.
I would really appreciate it if someone could help me with this, as I have not been able to find a suitable document online.
Thank you!
maybe one of you can help me. My energy consultant needs a document from my window manufacturer about the Uw value of the windows (standard windows), which should be about 1.20m x 1.48m (4 feet x 4 feet 10 inches), as far as I understand.
What does such a document look like, or does anyone have one available so I can use it as a template for my window manufacturer? He is not exactly sure what it should look like and said he has never had to provide such a document before. I am building a KfW 40 house and need to have this document.
It should probably state that the windows were installed according to RAL standards and include the Uw value of the windows.
I would really appreciate it if someone could help me with this, as I have not been able to find a suitable document online.
Thank you!
V
Verfolger7929 Jul 2018 14:03Ah, okay, I thought there was a standard window size of 1.20 x 1.48 meters (4 feet by 4 feet 10 inches) with a U-value indicated on it, and he confirmed that he installed the windows according to RAL installation standards. The profiles are from Schüco; he only installed the windows. Yes, the energy consultant specified a U-value of 0.76. The installed windows are Schüco Living 82 with a PVC-aluminum design.
Verfolger79 schrieb:
I thought there is a standard window size of 1.20 x 1.48 and the Uw value is indicated on it, and he confirms that he installed the windows according to RAL mounting standards.You were correct. According to the KfW guidelines, the required Uw value can be verified in two different ways:
It is allowed to rely on measurement values provided by the window manufacturer (not the installer). In this case, the manufacturer measures the Uw value of a window sized 1.23 x 1.48 m (4.0 x 4.9 ft) according to a procedure described in DIN EN ISO 12567. A testing laboratory then issues a certificate or statement indicating:
... blah blah ... measured according to DIN EN ISO 12567 with profile setup XY, glass ZZ triple-glazed 12-4-12-4-12 mm (0.47-0.16-0.47-0.16-0.47 inches) ... etc., window size 1.23 x 1.48 m (4.0 x 4.9 ft) achieves a Uw value of 0.7 W/m²K
Stamp, logo, signature.
This "standard window" then serves as a reference model for your house that meets the requirements. You provide the certificate to your energy consultant and that’s it. Every major window manufacturer offers this for their respective profiles and designs.
Second option:
The window installer or profile assembler calculates the Uw value for each window based on the proportions of frame and glazing according to DIN ISO 10077-1, summing the components to get the overall Uw value. On average, the required Uw value must be achieved. Usually, the carpenter’s software provides this calculation automatically. You then submit the complete offer to the consultant showing this information.
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