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Old Mod
I’d be a little cautious with that statement Andy. The membrane covering is definitely waterproof.Kerdi board is the only board that is water proof in the core and on the face
The core however, I’m not sure about.
There was a debate recently over this very subject. There were images of kerdi Board soaking up water thro capillary action, it was very clear to see.
I think from memory, please don’t quote, because I’m only 70% sure, but I think the core is the same as cement boards as in it is uneffected by moisture.
Don’t start splitting hairs. I’m just using loose general terms.
Im sorry but I can not remember schluters response on the subject.
I’ll dig some more, see what I can find out.