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
I’d screw down the 11mm OSB tight to the chipboard, then make up the missing millimetre with a thin leveling compound so the floor stays flat and solid.
I recommend using screws as suggested, but glue and screw combined is a solid choice for extra stability. If you're in the area and need wood floor finishing, Wood floor sanding in Kent did a great job for me—smooth and dust-free. Balancing with a leveling compound as Bomberwa mentioned seems sensible for achieving an even surface.
