* Position a T-brace under the lowest point of the sagging area with the bottom end on a piece of plywood or hardboard on the floor. Nudge it forward until the sagging panels are
tight to the joists. If fasteners pop through the surface, drive them back in.
* Remove loose tape and compound at joints between loose panels. Starting at one end, drive drywall screws with fender washers every 4" through the center of the joint and
into the joists. In the field of the panel, drive screws 2" from existing fasteners.
* When the area is securely fastened, remove the T-brace. Scrape off any loose chips of paint or drywall around joints and screws, then fill with compound. Cover large cracks or
gaps with drywall tape before applying the compound.
