Fire-rated joint system

A fire-rated head-of-wall assembly comprising:

• a header track configured to be coupled to a surface of an overhead structure, the header track having a web, a first flange and a second flange, the first flange and the second flange extending from the web in a same direction, wherein each of the first flange and the second flange is substantially planar;
• at least one stud coupled to the header track, an upper end of the stud located between the first and second flanges;
• at least one wallboard coupled to the stud, an upper end of the wallboard overlapping the first flange of the header track;
• a deflection gap formed between the upper end of the wallboard and the surface of the overhead structure, the deflection gap being variable between a closed position and an open position;
• a profile formed of a first material, the profile comprising:
• a first vertical leg adjacent to the wallboard;
• a second vertical leg;
• an upper leg adjacent to the web of the header track connecting upper ends of the first and second vertical legs, wherein the upper leg is parallel to a plane of the web of the header track;
• and
• a lower flange extending from a lower end of the first vertical leg, the lower flange including a curved portion;
• and
• a fire-resistant material strip, wherein the upper leg, the first vertical leg, the lower flange, and the second vertical leg are configured to be on a same side of the header track and positioned completely between a first plane defined by an outward facing surface of the first flange and a second plane defined by an inward facing surface of the wallboard.