| Are there any other reasons to not glue down C&L?
It needs to float because of expansion. The whole
floor expands and contracts as a unit. (And it needs
space around the edges for that, under the baseboard.)
There shouldn't be a problem if you put the right pad
T&G needs to be nailed. Each board expands separately.
You put down rosin paper rather than a foma pad. The
biggest difference is that CL is veneer on plywood.
It lasts only as long as the finish, making it a disposable
floor. T&G, whether pre-finished or not, is solid wood.
When the finish wears off you can have it sanded and
refinished. It's more work and more money, and you'd
need to rent a nailer, but you get a better floor.
If done right, neither should squeak. But you do have
to make sure the subfloor is solid and stable.