Sean,

Once the wood is acclimated to the low humidity it shouldn't move much,
shrink, swell, or crack. The question is, how long must the wood sit before
it acclimates. I'm guessing that the installer knows this and that if the
wood does crack due to dryness it will happen within the first year so the
installer can be called about repairs. Rent a wood moisture meter and check
a couple of pieces. I bet that the wood is already quite dry since it has
been sitting in a lumber yard for a while.

Dave M.