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I question how those joints can be lining up on joists. I'd start by pulling up some of the smaller pieces to see what I'm dealing with. Then go back in with full sheets. But your description sounds like a jack-legged mess. I'm wary of whether there's adequate structure under there.
There is no way in heck all those joints are on top of joists. Rip that disaster out and re-do it right (or as right as you can do). You'll probably have to sister along some joists and block between some, to get adequate support as you can't take out the existing walls.
Plywood subfloor longitudinal joints never line up on joists. They span joist spacing.
OP has indicated there is blocking between joists in some areas. That is often proper installation when using cut pieces.
If you are using a 4 mm click & lock floor tile and have enough height clearance to go with a 1/2 inch underlayment, that would be ideal! Although the underlayment appears to be “patch work”, as long as it is bearing on the joists and structurally sound, you could leave it in place. I can see several pieces that should be removed and replaced and ideally, no joint on a floor joist should extend more than 4 feet.
Once the bouncy or damaged 3/4 underlayment has been removed and replaced, a 1/4 inch top layer should be sufficient to support the vinyl flooring as Mike Jaquish has stated.
If you are using a 4 mm click & lock floor tile and have enough height clearance to go with a 1/2 inch underlayment, that would be ideal! Although the underlayment appears to be “patch work”, as long as it is bearing on the joists and structurally sound, you could leave it in place. I can see several pieces that should be removed and replaced and ideally, no joint on a floor joist should extend more than 4 feet.
Once the bouncy or damaged 3/4 underlayment has been removed and replaced, a 1/4 inch top layer should be sufficient to support the vinyl flooring as Mike Jaquish has stated.
Best subfloor I saw when we were touring new construction was 1x6 tongue and groove on a 45 degree angle to the joists. Solid as a rock.
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