Both faced and unfaced insulation in steel stud walls should be the same width as the stud spacing, typically 16 or 24 inches. The batt should be fit tightly into the open channel of the stud (see Figure 8). The batt should be cut to fit the entire stud cavity and should be tucked into the open channel of the steel stud, which helps support the batt and makes the insulation layer as continuous as possible. For batts with vapor retarder facings, placing the batt and the vapor retarder into the stud helps support the batt. Some installations require that the flange of the facing be taped or adhered to the face of the steel stud for support when practical, completely filling the cavity to help ensure insulation remains in place.

High performance or high-density batts do not require additional batt support with any type of attachment up to a height of 10 ft. to 12 ft. Standard materials that are not as stiff may require the use of clips to prevent them from slipping down within the wall cavity over time.