Permeable to water vapour? ("dampfdiffusionsdurchlässig")

[Torsten]

Hi, I'm looking for an English equivalent of the German word "dampfdiffusionsdurchlässig". It's an adjective and it means that something can be penetrated by steam diffusion. It's a characteristic of building materials. It means that moisture can diffuse through it.

Many thanks,
Torsten
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[NinaZara]

Absorbent material? Or moisture absorbent material?
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[NinaZara]

On second thoughts, perhaps porous? But I've only used this for soil.
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[Yankee]

Hi Torsten

In my dumb version of English, I might use words such as permeable, semi-permeable, or perhaps permeable to vapor (definitely not steam). I presume the reference is to building materials that "breathe", so to speak.

But don't take my word for it, Torsten. Perhaps you'd better wait for a translation in British English. You'll probably find it much more acceptable.
.