What is the insulation value of dry infill materials?
The lambda value λ (W/mK) is the insulation value of a material. The lower the lambda value, the better the material insulates. The lambda values of most bio-ecological insulation materials range between 0.035 and 0.040 W/mK. Below are some insulation values of several insulation materials.
| Material: Insulation materials from renewable raw materials: | λ-value W/mK |
|---|---|
| Paper flakes | 0,035 - 0,040 |
| Sheep wool | 0,035 - 0,040 |
| Wood fiber | 0,037 - 0,040 |
| Cork | 0,038 - 0,040 |
| Hemp | 0,038 - 0,042 |
| Seagrass | 0,039 |
| Coconut fiber | 0,040 |
| Cotton | 0,042 |
| Straw | 0,056 |
| Shells | 0,106 - 0,155 |
| Material: Insulation materials made from mineral raw materials: | λ-value W/mK |
| Glass wool | 0,031 - 0,044 |
| Rockwool | 0,031 - 0,044 |
| Silicate foam granules | 0,040 |
| Cellular glass | 0,040 - 0,050 |
| Perlite | 0,051 |
| Vermiculite | 0,053 |
| Material: Insulation materials made from petrochemical raw materials: | λ-value W/mK |
| Vacuum insulation panels (VIP) | 0,007 |
| PF (rigid foam) | 0,020 - 0,022 |
| PIR | 0,021 - 0,026 |
| PUR | 0,023 - 0,028 |
| XPS | 0,028 - 0,038 |
| EPS | 0,031 - 0,045 |
| Material: Insulation materials made from reusable materials: | λ-value W/mK |
| Levelling granules | 0,090 |
| Aerated concrete granules | 0,10 - 0,32 |
Source: www.lambda.be
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