Can I install Delta-FL in only part of a basement?
Here's what the Armtec rep had to say:


  We like the idea of Platon venting into an unfinished space so this
  would be good at your doorway. In regards to the partition walls, yes
  you would treat that as you would an outside wall.


So I guess not only is it ok, but they consider it a good thing to have some air circulation with unfinished spaces, while keeping the moisture out of the finished rooms.