Example


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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