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Example

 

Where innovation meets performance
Where innovation meets performance

The energy efficiency of an uninsulated 30 cm brick wall (1200 kg/m³) with internal and external plaster, as calculated (U ≈ 1.09 W/m²K), is considered to be moderate to inadequate by today's standards. Here is an overview of the assessment:

U-value range Assessment Typical building age in Germany
1.0 W/(m²·K) Very bad Unrenovated, period building before 1960
0.60 – 1.00 Bad 1960s–1980s without renovation
0.30 – 0.50 Average Partially renovated or lightweight brick
0.20 – 0.30 Good (Efficiency House) KfW Efficiency House Level
< 0,20 Very good (Passive House) High-quality insulation standard

🔥 Conclusion on the efficiency of the wall:

  • Without additional insulation, this wall loses a lot of heating energy – especially in winter.
  • The U-value is over four times worse than current new build standards (EnEV / GEG ≈ 0.24 W/m²K).
  • Summer heat protection is somewhat provided by the mass, but thermal insulation in winter is very weak.
  • Eligibility for funding (e.g. through KfW or BAFA) would only be possible with additional measures.

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