After removing carpeting in the family room to replace with hardwood flooring, the OSB has sagging between the joists. The sagging is around 1/4" to 3/8" worst case. The hardwood installer said he can't warranty the install because of the floor not being level.
Leveling compound specifies not to use on OSB. Can the OSB be sealed to use leveling compound?
Is there some other alternative? Replacing the OSB with plywood would be a major effort as the OSB is screwed and glued to the joists.
Appreciate your advice,
Otoe