Folks, Need to raise the level of a floor by 12mm and have a load of 11mm OSB to hand. Subfloor is 18mm chipboard screwed to joists What's the best way to fix? Screws, nails, staples or glue and screw? What size screws/staples etc? Does the OSB overlayment need to run at 90 degrees to the chipboard subfloor or in line with it (avoiding joints below obviously) Cheers
