I am reconditioning a wooden floor; I pulled up the carpet and am repairing, levelling and then painting the so-so boards I found. I already tried replacing the nails with screws but found that the boards are pretty noisy. Not so much squeaky as cracking sounds if you know what I mean.
There's a lot of wood added to the original joists because the house is very old - both alongside the joists and as 'noggings' (been looking at this guide). It's cheap ply and I think this is causing it.
As I have to level it anyway I can put some material between the two layers (there was a load of scrap wood slivers there currently). I read you can use cardboard or plastic too. As I want to maximise the quietness I had the brainwave of using a layer of thick carpet underfelt - not the foamy stuff but wool or felt.
What do you think of this idea and does anyone know the best material for levelling to reduce noise?