Quote:
Originally Posted by idontknow
Though if the tiles are sagging, it'll wreak havoc on your drywall installation. As messy as it sounds, I used a belt sander to grind the humps down. It was still less messy than removing the tiles and ceiling insulation.
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That's a mistake. Just install sheetrock over them and it will flatten out if the humps are to bad. If they are right over the joist, just screw the tile back into place to reduce the hump. Really, how bad of a hump is it?