Provided herein are example aspects of a fire sprinkler assembly and a method for adjusting the height of an adjustable drop. In one aspect, the fire sprinkler assembly can comprise a bracket hub coupled to a bracket bar; a flexible conduit; an adjustable drop coupled to the bracket hub, the adjustable drop defining a lengthwise axis oriented transverse to the bracket bar, and the adjustable drop comprising: an inner casing, wherein the flexible conduit is directly coupled to the inner casing; and an outer casing surrounding the inner casing, the inner and outer casings including corresponding threading to permit rotation between the inner casing and the outer casing to adjust an axial height, along the lengthwise axis, of the inner casing; and a sprinkler head extending from the adjustable drop.