The wX Liftslide sliding door has panels that stack to the interior or exterior of a wall, maximizing the opening and eliminating the need for a pocket. The panels lift onto rollers and glide on the bottom track that rests only 3/16-inch above the finished floor. When lowered, the door weight, a special gasketing system and multipoint locking provide weather resistance and security. Weiland Sliding Doors & Windows.