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Concrete lambdaLambda value concrete
Reference page for concrete lambda values used in wall and structural comparisons.
Used for quick thermal checks of walls, roofs, and floors.
Reference lambda value for structural concrete.
Shown as a 10 cm reference layer for comparison.
Lower lambda means better insulation performance.
Lambda reference: Structural concrete
This page highlights the thermal conductivity of the material and shows how it behaves in a simple comparison layer.
| Layer | Material | Thickness | Lambda | R |
|---|---|---|---|---|
| Layer | Material | Thickness | Lambda | R |
|---|---|---|---|---|
| Reference layer |
Reference layer
Slabs and load-bearing elements
|
10 cm | 2.300 W/mK | 0.04 m²K/W |
| Surface resistances | 0.17 m²K/W | |||
| Total resistance | 0.21 m²K/W | |||
What lambda means here
R = d / lambda
Lambda describes how well the material conducts heat. A lower value usually gives a better insulating effect for the same thickness.
U = 1 / (Rsi + sum(R layers) + Rse)
This reference page uses the material's catalog value and a simple 10 cm comparison layer.
Related material pages
How To Calculate U Value
Open how to calculate u value for the next step in this journey.
Open next stepInsulation Thickness Calculator
Open insulation thickness calculator for the next step in this journey.
Open supportOpen the calculator
Use the main calculator to edit layers, compare materials, and export a custom result.
Open calculatorWall calculator
Switch to the dedicated wall page for broader wall guidance and faster comparisons.
Open wall pageR-value vs U-value
Compare the two thermal metrics before choosing a wall or roof build-up.
Open comparisonMaterial note
Dense concrete conducts heat more strongly than insulation materials, so the wall leaf is only part of the result.
Use case note
Use this page to compare a dense wall leaf before adding insulation.