I did maple floors with walnut inlays about eight years ago. In some
of the spots where I couldn't get a good swing with the nailer, I used
a trim nailer, bigger nails than a brad nailer but not so big as a
framing nailer and definitely smaller than the nails that come out of
a flooring nailer. I've had no problems at all with the floor staying
in place and that's with three kids, moving grand pianos across the
floors, etc. Keep in mind, however, that the spots where I couldn't
swing the hammer are not the highest traffic spots but I don't see any
problem with it at all. If this is solid wood flooring, I don't know
that you can glue it.
If you are talking about 3/4" wood, the "nails" used to nail it are
serrated cleats. Rent the nailer and use them.
For the boards that have to be face fastened, use countersunk screws
and fill hole with face grain plugs (unless you like looking at putty
filled nail holes).
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