The floor is engineered joists, and the sub-floor is tongue and grove glued and nailed.
This past fall after we turned the furnace on we developed a squeek in 2 areas of the home. The first was the kitchen (right in front of the sink). The kitchen area is tiled. And the second was in the family room (hardwood flooring).
I figured the easiest way to fix the problem was to go to the basement and put a couple screws in the joists to the sub-floor in the kitchen area. What a mistake - problem got worse - now I have more squeeking in that area.
I haven't attempted doing the same to the family room as I don't want to compoud the problem.
After looking at the area again - I noticed that in both areas where the squeek is - its where the tongue and groove sub-floor mates with another sheet of plywood. In both areas they used clips.
Before I go through the effort of popping tiles off in the kitchen (travertine) - does anyone know of something else I could try ? I would imagine the problem has something to do with the moisture level in the home after I turned the furnace on. I have fiddled with the humidity and actually noticed by lowering the humidity it actually reduced the squeek in the kitchen, but made the family room worse.