To add to Jim's random Kerdi Board facts i tested how much weaker the Kerdi Board is when it is wet. Like when the orange surface is pooked and the cardboard layer is exposed.
Kerdi Board needs the cardboard layer for strength. You can imagine where I'm going here. Kerdi Board is crap. Avoid it like the plaque.
Head to head. Wet Kerdi Board vs dry Kerdi Board. Dry Kerdi Board won by over 60% if my memory serves me right.
Ask your self why Kerdi Board needs Cardboard (pressed paper mdf type layer) to be strong. We know Jim likes it. I know a few others that do as well - but for the rest of you if you waant Kerdi Board make it yourself out of cement board and Kerdi.
Are you searching for information on shower construction? For my opinion please check out No-Curb.com. Link Here: www-no-curb.com
John Whipple's Contact Info: email@example.com 604 506 6792
Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.