Reducing bounce in chipboard floor

[chilluk]

I want to laminate our dining room floor which has a chipboard floor which I know has a very shallow void underneath which has at least gas pipes in (maybe electrics / water also!).

This chipboard floor is a bit springy in places and so rather than just using thick underlay, I was going to ply first and then use thinner underlay.

What thickness / grade of ply should I use to go over it do you think?

 

[JohnD]

pull it up and throw it away

replace it with 18mm or 25mm WBP ply.

 

[chilluk]

I know what you are saying but it would be a nightmare as the floor obviously went in before the partition walls so the boards go into 3 other rooms! Would rather go over the top if possible.

 

[JohnD]

the partition walls are most likely built on doubled joists. You can deal with that when you get to the wall. The old chipboard can be sawn off where it meets the wall. No big prob.

chipboard is a terrible material for floors and where it bounces it is probably already cracked or has unsupported joints.

pull it all up and throw it away.