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XPS lambdaLambda value XPS
Reference page for XPS insulation, often selected for moisture-resistant applications.
Used for quick thermal checks of walls, roofs, and floors.
Reference lambda value for xps.
Shown as a 10 cm reference layer for comparison.
Lower lambda means better insulation performance.
Lambda reference: XPS
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
Moisture-resistant insulation
|
10 cm | 0.034 W/mK | 2.94 m²K/W |
| Surface resistances | 0.17 m²K/W | |||
| Total resistance | 3.11 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 pageLambda values table
Check the material catalog when you want to compare conductivity values quickly.
Open materialsMaterial note
XPS is usually chosen when moisture resistance and strength matter together.
Use case note
Check the material catalog and calculator to see where XPS is the right fit.