Question and assumptions
How does insulation thickness affect one-dimensional heat transfer? Assume a 0.25 m structural layer with λ=0.70 and insulation at λ=0.04 W/(m·K). These are demonstration values, not specifications for the illustrated assembly.
Method
R = 0.13 + 0.25/0.70 + d/0.04 + 0.04. U = 1/R. A steady-state one-dimensional calculation does not determine thermal inertia or condensation risk.
Conclusion and limitations
Increasing insulation reduces U with other inputs unchanged. A final solution requires structural, moisture, fire and junction checks. The visualisation is a concept and must not be used as a construction detail without project-specific validation.
| d, m | R, m²K/W | U, W/(m²K) |
|---|---|---|
| 0.15 | 4.277 | 0.234 |
| 0.2 | 5.527 | 0.181 |
| 0.25 | 6.777 | 0.148 |