I agree with Tara, Marie. These are epiphytes, so in truth all the roots are "air-roots". Phalaenopsis, by its nature, is always trying to grow out of the bark, thus those roots on the top of the bark. Is this 100% Douglas fir bark?
Oh, because your media doesn't seem to hold moisture well, I would not hesitate to water every 3-4 days during the spring and summer months. Rather than simply pouring the water over the bark, I would fill a bucket, bowl, or basin with tepid water, at enough depth to just cover the top of your bark media. Leave it submerged for 5-10 minutes. You need that bark to have time to soak up the moisture so that it can slowly release it. If you are simply pouring water over the media, it is running through too quickly to really wet the bark. You may need to hold your hand over the media while the pot is submerged. These things tend to float.
Phal. often give me fits.
