Installing engineered wood on old floorboards

Hi,

It seems every website I find gives different advice. Its a 1930s house with not too level floorboards.

I'm leaning towards 6mm ply then 14mm engineered wood floated on top. Does this sound ok? Should I also have a moisture barrier?

Ta much

 

On floorboards no you don’t need one. Is the floor flat ?

 

Ok thanks for the info.

I wouldn't say it was flat. Some floorboards are cupped so there's a 2-3mm lip compared to the board next to it. There's also a 3mm lip where one room transitions to another.

There's a general slope to one room of 10mm over the length of my 1.8M spirit level.

How bad is it? Go on Doc tell it to me straight

 

Sand down high board edges
9mm ply and if needed fibre screed to get levels