Wood floors are usually a simple matter. You nail 3/4-inchthick
planks or hardwood strips to a sound, dry, level subfloor,
then hire a reputable sub to sand and finish them to
perfection. When circumstances permit, this is the best
option. That's because a solid wood floor is more than a covering.
It adds strength to the floor system, and can be repeatedly
refinished.
But solid floors have limitations. For instance, what do
you do if you've got a below-grade or concrete subfloor that
might subject the hardwood to high humidity? Or a floor
height that doesn't permit underlayment? Or a project that's
too small to interest a sanding sub? Or a