Did I mount my tolumnia properly?

[tim_r95]

So last weekend I was at an orchid show and I picked up a little tolumnia I'm pretty sure it's labeled william thurston "Robson" and it was in a little pot with some ferntree chunks, and I wanted to do something different with it. So I decided I would mount it to a piece of mopani wood I had left over from when I had my freshwater fish tank set-up. So I got it mounted on there in sort of a ridge in the wood, and I just covered the roots over with sphagnum moss. But, I've been looking at some pictures of other mounted orchids and it seems like a lot of them have most or at least some of the roots hanging out in the open air. Should I have done this with mine? I asked this on another thread about this orchid also, but I'm hoping some people with mounting experience can help out. So, I've been watering the little guy in the morning making sure the sphagnum moss is completely wet before putting it back, but it seems like every day the moss is completely dry by like the early afternoon. Should I water it more often?