I have posted the video below of the upper level.
Plywood floor squeaky in my new house.
Since day 0 one of the major issue had been my flooring both main level and the upper level.
When nailed down the sub flooring will be sucked down unevenly.
See below for a shopping list and tools subscribe to this old house.
Over time the portions of the floor that have been sucked down will try to go back to a flat and level position.
Before i attempt to try anything i thought i would see what you suggested.
Separate wooden bridging members to eliminate noise problems.
Squeaky floors may alert you to kids sneaking in past curfew but they ve got little else going for them.
This old house general contractor tom silva silences some squeaky floors.
Nails rub on plywood when walking on floor and cause the squeak.
Annoying floor squeaks common in many homes typically occur after the house has settled and flooring lumber has dried out and shrunk.
With hardwood floors drive ring shank or cement coated flooring nails into the seams between boards.
Sub floor is osb tongue and groove 3 4 on upper floor with carpet main floor sub floor is osb tongue and groove 3 4 on lower floor with 3 4 hardwood.
Which is all carpeted.
For squeaky floor repair begin from underneath the floor if you can.
Floor joist tops not level.
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.
Squeaks happen when a house settles and wood flooring dries and then expands.