A sealing gasket assembly for sealing a head-of-wall of an acoustic wall construction. The acoustic wall construction includes a ceiling track, having a given width, secured relative to a floor underside and supporting a plurality of studs with each of the studs including a stud face. At least one wall panel is secured spaced from and not in contact with the stud faces such that a spacing zone is defined between the stud faces and an inner surface of the at least one wall panel. The gasket assembly includes an insulating gasket configured for a main section thereof to be positioned between the ceiling track and floor underside, the main section defining first and second lateral sides which are spaced from one another a distance at least equal to the given width. A secondary gasket is associated with the insulating gasket and includes a sealing member extending outwardly relative to the first lateral side and configured to engage an upper portion of the at least one wall panel and a portion of the floor underside and form a seal between the at least one wall and the floor underside.

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