μ (dry) Vapour diffusion resistance value
Water vapour diffusion resistance value for conditions assuming a dry state.
The diffusion resistance (μ value) is a parameter to determine the exchange of moisture of a construction material. The lower the μ value, the easier it is for vapour to penetrate a substance.
Definition: Ratio of the vapour diffusion coefficients of the air and that of the relevant substance.
Proof: Manufacturer information
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