A sideform molding accessory (10) includes a cap member (12) for capping an end (14) of a sideform (16). The cap member (12) includes a pair of opposed sides (12.1) and (12.2) and a peripheral portion (13) with at least a part of a profile (18) of the peripheral portion (13) complementing a molding surface (20) of the sideform (16) A retaining member (22) extends from one of the sides (12.2) of the cap member (12) for retaining the cap member (12) in position relative to the end (14) of the sideform (16).