Uneven Ply over Floorboards

[d1ynovice]

Hi

I'm trying to put down hardwood flooring over floorboards. I've put down 5.5cm thick ply to cover the uneven floorboards. I know the ply should prob be thicker but I got it cheap.

I've screwed down the ply but I get uneven bits (bumps) where the ply is screwed to parts of the floorboards that are uneven/raised. Means the hardwood flooring is not level. Any suggestions? sand down the ply where I have uneven bits? unscrew the ply in some parts so it raises the level?

Any suggestions? Is there a neat trick I'm missing.

Any help greatly appreciated.

BW

Chris

 

[Gerrydelasel]

Putting foam underlay under the ply can help. Depends how bad it is.

 

[Deleted member 174758]

Where it is exceptionally bad you may need to lift the plywood, flatten (power plane/belt sand) the humps, refix the ply then screed out with a self-levelling compound such as BAL or Arditex first. Thicker ply would have helped. BTW we generally fix thin stuff on 150mm centres

 

[Doggit]

You didn't need the ply. You could have put down the underlay, and then the hardwood floor. Is it click flooring, or have you glued it.