WUFI

I posted my answer without knowing you had answered Thomas. I will check this out. Thanks to you both!

Hygrodiode is a vapor retarder which is composed of a synthetic fabric sandwiched between perforated polyethylene film (inside) and strips of special moisture dependent film (outside). I guess the strips are polyamide film, which changes its vapor permeability with the ambient humidity conditions ...

I was wondering if the water permeable Hygrodiode is suited for calculations in WUFI?

Its capacity to absorb and transport liquid water is a vital property which seem to be dropped if you design the product on your own on the behalf of Sd-values only.

I am using the WUFI 1D Pro5.1 version ...