As I understand from my friend, he recently had water damage to his kitchen floor with no inclination of the leak until going into the basement and finding the leak underneath the dishwasher. He wants to figure out a way to fix the damaged flooring (sub floor). He mentioned something about liquid nails. The flooing is very thin and he felt if he screwed upward, he may have the screw come out to the main level of the kitchen floor. He does not have a lot of warping, but the damage has been done. the house is only 6 years old.