On Thu, 26 Jun 2014 10:03:30 -0400, "Mayayana"
wrote:


| I have oak floors. Nail heads come up, I push them down, and they come
up
| again.
| I won't even ask why they come up

Probably expansion and contraction. Do you perhaps
have temperture extremes in the area? No central
heat, or an uninsulated area below the floor?

I've never seen it occur as a major problem, but
sometimes in old houses, nails need to be tapped
down occasionally.

If surface nailed flooring (like old pine plank floors) have problems
with nails loosening it is almost always because something is
"giving". Insufficient support in the sub-structure the floors are
fastened to. If nothing moves, nails won't pop.