1706.1 Requirements for Retrofit Studs
Except as allowed by Section 1706.5, a retrofit stud shall be installed at each primary stud longer than 3 feet (914 mm) where lateral braces can be installed using the methods of Section 1707. The size of retrofit studs shall be as required by Table 1704.1 for the appropriate retrofit configuration. Where straps are installed using the L-bent strap method of Section 1708.1.1, retrofit studs shall extend from the top of the lower lateral brace up to the bottom of the upper lateral brace, except that a maximum gap of 1/8 inch (3 mm) is allowed at the bottom and 1/2 inch (13 mm) at the top. Where straps are installed using the U-bent method of Section 1708.1.2, retrofit studs shall extend beyond the ends of lateral braces such that lateral braces can fully butt against the retrofit studs.
Exception: A retrofit stud need not be added where the distance between it and an adjacent retrofit, primary stud would be less than 141/2 inches (368 mm).