Inside Corner—Two Drawers. Where cabinets meet at an inside corner, a 2 1/2-inch filler strip on each side prevents interference from drawers and pulls. Door at End of Run. Where cabinets terminate at a wall, a filler strip can also prevent interference from the lockset of an adjacent door.
Built-up door or window trim can also cause problems. The cabinet door can’t be opened because it’s obstructed by the trim
A filler strip solves the problem.
End Wall. Scribe filler strips to close gaps where cabinets meet irregular or out-of-plumb walls. End Panel. At the end of a cabinet run against an out-of-plumb wall, scribe an extended finish end panel to match the wall. If the cabinet end is a standard depth, glue and scribe an extension made from a filler strip; as a last resort, cover any gaps with molding.
Correcting out-of-level conditions before ordering cabinets can minimize appearance problems at soffits and ceilings.