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• Posted in thread: Vinyl or Tile over OSB subfloor on 10-22-2008 at 06:37 PM
  3/8" OSB is too thin for sub floor. Min 3/4" is required.It becomes uneven due to thin
  subfloorYou need to add 3/8 or 1/2" plywood to prevent more sagging first.and then you can
  install particle board...