Interior wall cap for use with an exterior wall of a building structure

A wall cap for an interior partition wall of a building structure, the building structure comprising at least one exterior wall and at least one interior partition wall, a gap formed between the at least one interior partition wall and the at least one exterior wall, the wall cap comprising:

• at least one elongated rigid member having a first end configured for attachment to the at least one interior partition wall and a second end positioned adjacent the exterior wall, and an underside for receiving at least one sound-damping material, the underside of the elongated member defining a sound-receiving chamber with at least a portion of the interior partition wall;
• wherein, when the at least one elongated member is mounted in cantilever fashion to a portion of the interior partition wall, such that the elongated member is allowed to move relative to the exterior wall, and substantially fills the gap between the interior partition wall and the corresponding exterior wall, at least one of sound and vibration emanating from the building structure is dampened by the wall cap before being transmitted to the interior partition wall.