Which lambda value is relevant for insulation?

  • Erstellt am 2023-05-14 21:00:24

NoPhonkNoLife

2023-05-14 21:00:24
  • #1
Hello everyone!

I have been trying to find information about the relevant Lambda values over a longer period, but unfortunately I have not been successful. I am building my house out of aerated concrete, but I do not know whether I should calculate with the thermal conductivity λ10,dry (W/mK) 0.072 or the design value of the thermal conductivity λ (W/mK) 0.08.

It is relevant from the perspective of the thickness of the exterior wall. If I calculate with the dry value, a 30cm thick wall would be sufficient (U-value = 0.230), with the design value it would be (U-value = 0.255).

Thank you very much for your time!

Regards Johann
 

xMisterDx

2023-05-22 13:17:25
  • #2
If I remember correctly, the stone with lambda 0.08 does not exist in 30cm, but only from 36.5 upwards.
 

dertill

2023-05-22 13:56:35
  • #3
For the Gebäudeenergiegesetz / KfW / Wärmeschutznachweis / Energieausweis ALWAYS use the design value. The nominal value is only EU stuff and is not considered in German legislation.
 

NoPhonkNoLife

2023-05-22 21:18:35
  • #4
Not with Ytong, but with bauroc it does. It costs 5 times less than with Ytong. Thank you very much for the clarification. I’m already embarrassed, I’ve been dealing with this topic for more than 3 years but never found anything about it.
 

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