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Thanks for taking the time to read this and to respond.




I certainly don't know the solution to your problem, but wonder why your
whole room
rumbles when someone walks across it - my logic tells me the flooring
isn't supported
by the joists. Dumb newbie that I am, I would check the joists,
subfloor and flooring
with a level to see if there is significant disparity.

How large is the room? How are the posts in basement spaced? How are
floors in
rest of the house? Anything else out of whack, like doors or cracks in
walls? Seems
that you wouldn't have the vibration/rattling issue if the joists were
supporting the
flooring as you walk across the room.