Or you could go all out and use smartfloor or similar product, the quality is rarely below very high.
I layed Hardboard in my cabin prior to vinyl and sounds like I should have done it rough side up and wet. It has warped. Any advice on nailing back down? Screws, nails? take it all up take all the nails out turn it over and wet?
Yes agreed however. I’m looking to resolve without starting again as I’m too busy and skint to do that