Abstract: A resilient strip is provided for self-sealing, self-stabilizing installation in a floor expansion void between a room wall and the edge of the floor. The main body of the extruded resilient strip is generally triangular in cross section with a recessed base adapted to engage the wall side of the expansion void and a truncated apex adapted to seat against the floor side of the expansion void adjacent its upper edge thereby placing the upper and lower sides of the strip in compression transversely thereof. The upper side of the strip preferably includes an integral baseboard flange tapering to a thin wall-hugging edge. No fasteners or adhesives are required for installation.