Another sqeaking floor.

You could try silicone spray but if that was the problem why would it have stopped for a few months after putting the screws in. You might try retightening the screws. Also when putting in screws, put a little cake soap on the threads. Makes them go in much easier.

Here it might matter: Will it make them loosen easier too?

Try running a circular saw down the joints just deep enough to cut thru the flooring

I doubt it. Heat from screwing the screw in makes the soap soften and act like a lubricant. Once its in it the screw would cool off and the soap would have no effect. That was the only worthwhile tip I remember from shop class in high school.

I believe he is kidding.

no I have done it several times to relieve the sheets so they do not rub due to flex in the support system in some houses ie 24in centers....shoddy support ect...

I guess I better stop using liquid soap.

I think you hit the problem...shoddy support. The joists are on 16" centers but this location is where the opening in the floor is made to the basement steps. I think either the joists are not installed correctly (maybe the hangers) or the sub-floor joints were not gappped correctly.

Peter Griff>