A release device for vertically adjustable barriers (theatrical curtains, advertising banners, sun control systems, environment altering systems, acoustic control systems or scenic back drops, etc.), with a support assembly (e.g., roll assembly) with first and second roll supporting frame structures and a tensioner extending between the frame structures. The tensioner can be a cable extending parallel to the roll's axis of rotation. The tensioner compensates for gravity induced sagging of the roll (e.g., a multi-sectional roll). The frame structures are suspended with suspension lines that extend down from an overhanging mount and the frames compress the ends of the roll and negate sag in intermediate area of roll. The roll is supported by bearing sets on the frame structures.