When you glue a hardwood floor to concrete the subfloor must be completely level.
Creek on the second floor.
Occasionally boards or even floor.
When nailed down the sub flooring will be sucked down unevenly.
They soon discovered termites had feasted from the attic to the basement.
If there are voids the boards can flex into them and make creaking sounds as they rub together.
Squeaky floors are almost always caused by nails that missed the floor joists when the installer was installing the floor.
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Over time the portions of the floor that have been sucked down will try to go back to a flat and level position.
How to fix a squeaky upstairs floor.
It had been renovated prior to their purchase.
If the tops of the floor joist are not flat and level then the sheets of plywood or sub flooring will not be fully supported evenly.
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