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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