Kerdi Wicking

[GCloud]

So I've installed a base, covered it with Kerdi and all seems good as far as the flood test goes.


But I've got a beef with the Kerdi. Here's why.

The layer of fleece wicks water.

I'm testing a strip of kerdi submersed in water with water soluble ink marks on it. See pics. After one hour the bottom mark is gone. Completely. We'll see what happens over the next while.

My question is this...

A strip of kerdi hung vertically allows capillary action, so how can I expect proper drainage of water on a slope of 1/4" per foot? I've increased this slope to exceed local code, but I still don't see this water going anywhere.

Sure the bulk of the water is going to drain, but the thin layer interwoven in the fleece is not going anywhere fast. Sounds like a nice little breeding ground for mold and mildew, no?

I've just come from a situation of mold and mildew and I really don't want to go back to that.