I am levelling some floorboards, with a view to painting them afterward and having a wooden floor. Previously there was a lot of scrap wood shims under there. Because these are only thin cheap wood many have been split when the nail passed through so I don't think I can reuse them.
As I am replacing the nails with screws, I had the idea of using rubber, plastic or metal washers for the levelling (if I can find a big bag of thick ones), so I can stack 1, 2 or 3. Rubber might even help make the boards quieter.
Is this a stupid idea or does anyone have a tried & tested way of doing levelling?