hmm icic
well there's 2 main things u can opt to do.
(1) leave the roots--a lot of us have phal roots growing out of the medium, just the way these guys are. in the wild these roots would be hugging the tree and they aint hiding under anything =) they might dry out or they might not depending how dry its location is, but if they have lot of roots in the pot, i wouldn't worry
(2) get a little moss and cover the top of ur bark, that will help increase the moisture around the roots so they dun try out.
here's a prime example of roots growing outside the medium. this person comes from florida so itz more humid, but none the less it could be done
http://www.orchidboard.com/community...p?searchid=811