an acoustical building panel and method of manufacturing it are disclosed . embodiments of the panel include a porous nonwoven scrim , a coating deposited on the scrim , a base mat , and an adhesive deposited on either the base mat or the scrim in a discrete form such as in droplets . embodiments of the method of manufacture include steps of perforating the base mat , applying the adhesive to the base mat in the discrete form , laminating the scrim onto the base mat , and applying the coating to the scrim surface .