tr_guy79 wrote:Bob,
The flooring that I am using is solid oak, so it will hold up better than standard sawdust and glue flooring. I plan to use a vapor barrier underlayment (Silent Blue), and liberally screw it down. ...
-Shane
Oddly, not so. Wood expands and contracts with moisture changes, but does so across the grain and not noticeably along it. Some (ok, most) fiber products will just puff up and disintegrate, but some are quit water resistant and stable. "Plywood" based (laminated flooring) is usually pretty stable.
Screwing or gluing solid wood down in an environment where the moisture level changes dramatically (and a boat has to be tops in this regard) is almost guaranteeing that the wood will split or buckle or something else bad. I've seen wide wood boards that were well attached (glued and screwed) to 3/4 inch plywood subfloor curl the plywood up (pulling up the nails that held it to the floor joists) when the wood planks dried and shrunk a bit.
You will be better off than that with parquet, since the pieces are small and the direction of the grain changes often, but you would be much better off with wood that is inherently dimensionally stable (teak is better than oak), or any veneer over plywood or other stable substrate. Ironically, the man-made or composite flooring works much better here than solid wood.
If you put down strips or parquet of oak, remember the individual pieces will move in width but not length
For parquet or strips, if you get the interlocking kind (ideally not solid wood but engineered) and just let the floor "float", being held down by trim on the edges, this can work well on a boat.