Lambda values table: product examples
A lambda table must identify the product and measurement conditions. These EPS, XPS, concrete and aerated concrete examples are not universal design values. Open the material page for the scope of each source before using λ in a calculation.
Document examples, not design defaults
| Product / source | λ [W/(m·K)] | Scope |
|---|---|---|
| Austrotherm EPS 038 FASADA SUPER — Poland | λD ≤ 0.038 | Product-specific or historical example; verify current conditions |
| URSA XPS ECO N-III-L — Poland | 0.031–0.036 | Product-specific or historical example; verify current conditions |
| The Concrete Centre — generic ready-mixed concrete EPD | 1.6 | Product-specific or historical example; verify current conditions |
| bauroc — product catalogue, 2020 | 0.072–0.15 | Product-specific or historical example; verify current conditions |
Check before using λ
- Record the exact product, market, density or thickness and document revision.
- Distinguish declared λD from the design value for the intended moisture and temperature. Unit conversion does not perform this correction.
- Confirm thickness in metres and use the same material conditions throughout the calculation.
From lambda to layer R
R [m²·K/W] = d [m] / λ [W/(m·K)]
For an illustrative 0.10 m thickness, the table below converts each quoted document value to layer R. These sources describe different products and conditions: the results show arithmetic, not a ranking of interchangeable materials.
| Product / source | d [m] | λ [W/(m·K)] | R [m²·K/W] |
|---|---|---|---|
| Austrotherm EPS 038 FASADA SUPER — Poland | 0.10 | ≤ 0.038 | ≥ 0.10 / 0.038 (≈ 2.632) |
| URSA XPS ECO N-III-L — Poland | 0.10 | 0.031–0.036 | 2.778–3.226 |
| The Concrete Centre — generic ready-mixed concrete EPD | 0.10 | 1.6 | 0.0625 |
| bauroc — product catalogue, 2020 | 0.10 | 0.072–0.15 | 0.667–1.389 |
Interpretation and source limits
A table is useful for locating a document, not choosing a universal λ. Check the material page, exact variant, moisture basis and intended use before comparing whole assemblies.
Read declared and design thermal valuesMaterial lambda references
Sources and verification scope
This directory combines the EPS and XPS product-page examples and the historical concrete EPD and bauroc 2020 catalogue. Open each material page for its document scope; the examples do not establish local declarations for other markets.