The core will wick Randall .... that's why we need to use a strip off Kerdi membrane over all the seams. (pain in the ass)I'm building a steam shower with the 1" kerdi board.
http://www.ontariotile.com/steam-shower-1.html

Theoretically that foam core should not wick any water, it's supposed to be a polystyrene foam. I think the wicking comes from the make up of the face layers when exposed to water.
I just wanted to see what would happen to an unprotected raw board. I'm sure it will be fine when all seams and fastener heads are covered with Kerdi Band.
I personally don't think that board should fall apart. Thats all I'm saying.

BTW, sweet shower!

I agree Randall. I have 1 sheet of the 1" board which has delaminated from the core on one side. I'm not happy with that.

Was that a pc that was exposed outdoors?

Hi Harry, Nice shower you're building! I'm concerned that there isn't enough plumbing in there!

I've heard some rumblings about problems with Kerdi board made here in the US, and that they are bringing in stock that was manufactured in Germany.

What is your opinion on the speed of the installation of the Kerdi board/kerdi band/kerdi fix/etc. versus installing drywall or cbu and then covering with Kerdi membrane in the traditional way?

I don't know Randall ... it was on the outside layer of a bundle, so it could have been. Shouldn't make a difference though because it's waterproof and vapor retardant.

Hi Rob, yep ... there's a lot of plumbing. There are 2 sets of 3/4" supply lines for 2 separate controls.
The speed of installation seems too redundant with applying the kerdi band to all the seams. I stopped using Kerdi for anything but showerpans over the last few years. I'll continue to use Kerdi board in my steam showers though. It seems like the best product for the job.

Harry, who's linear drain are you using and how expensive was it?

Randall, I haven't bought or seen in person a linear drain, but several guys have told me that there are linear drains on the market that are in the $400-500 range.

Harry, you've confirmed my suspicions--Kerdi board IS NOT as fast as they say it is.

Could it really be that the marketing people are stretching things a bit?

I'll get the name of the drain for you Randall. I think they bought if for around $300 .... not sure.

Rob, the Kerdi board is fast to install but it's the taping of the seams that adds the time on. Also, the 1/2" board seems a little too flexible between 16" center studs ... so I always upgrade to at least 3/4", or as in my steam showers, I'll use 1" thick boards.
If I had the guys Schluter use in their video working for me .... I'd be fast too.