I'm going to be using the Kerdi shower pan and membrane to seal a steam shower. I understand the process of installing the membrane, deck and preparing the wall and ceiling substrate.
This question is specifically about the subfloor.
Do I need to apply a waterproofer such as Redgard to the subfloor ply before I apply the thinset to set the Kerdi shower pan?
The same answer, I presume, is applicable to a dry pack pan as well?