Ply or Fibreboard?

[dazlight]

Prime neat with a floor primer then use a smoothing compound like level flex on uneven bits.
I'd ply with 6mm then do the screed.
Plywood with 12mm and then use less screed if it's still needed.

 

[Chrispy6169]

Just to throw this into the mix, what about sheet 6mm mdf to cover the existing floorboards? Its cheaper than ply and still a solid material

 

[AronSearle]

If you are just going to board over it for level, then it does not matter to much if it is plywood/hardboard/mdf.

There are slight differences, but at that thickness for this job it is rather much of a muchness.

6mm is a Okish, *good* plywood would be a bit stronger than MDF but 6mm is 6mm (i.e not much) and there might still be a little bit of flex over bumps.

Suck it and see, I would be more comftable with 9mm.

 

[Chrispy6169]

That's great, thanks for your help. I'm going to decide at the weekend what I want to do

 

[Chrispy6169]

Decided on 7mm finefloor fibreboard.

Thanks for all the help