1708.1.1 L-Bent Strap Method
For Configurations A, B and C, retrofit studs shall be attached to lateral braces in accordance with Figure 1708.1.1(1) and Figure 1707.1(1) or 1707.1(2). For Configuration D, retrofit studs shall be attached to lateral braces in accordance with Figure 1708.1.1(2) and Figure 1707.1(1) or Figure 1707.1(2). Attachments shall comply with the following conditions except where attachments of retrofit studs at omitted lateral braces are in conformance with Section 1707.4.1.
- A strap of the gage specified in Table 1704.1 shall be installed to the retrofit stud and lateral brace such that one end of the strap is applied vertically to the retrofit stud on its vertical narrow face nearest the exterior of the gable end wall, bent 90 degrees, and applied horizontally to the wide horizontal face of the lateral brace.
- Straps shall be long enough and bent appropriately so that the number of fasteners required by Table 1704.1 can be installed while maintaining a minimum distance of 23/4 inches (70 mm) from fasteners to the end of retrofit studs and long enough to clear the retrofit stud end butting the lateral brace.
- Straps shall be permitted to be twisted or bent where they transition between the tops of retrofit studs and lateral braces to follow roof pitch. Straps shall be bent only once at a given location, although it is permissible that they be bent or twisted at multiple locations along their length. The bends of straps over the ends of retrofit studs shall be right angles.
- Compression blocks shall be placed on the lateral braces and butted directly against the primary stud or the retrofit stud. Figure 1707.1(1) (trusses) and Figure 1707.1(2) (conventionally framed) show the placement of a compression block against the existing stud. The minimum contact area between compression blocks and primary or retrofit studs shall be an area equivalent to 11/2 inches by 11/2 inches [2.25 square inches (1452 mm2)]. Angled contact is permissible. Compression blocks shall be allowed to be placed over straps or beside straps.
- Compression blocks shall be fastened to lateral braces using the number of 3-inch fasteners required by Table 1704.1. Fasteners shall be placed such that they are a minimum 23/4 inches (70 mm) from the ends of compression blocks, a minimum 23/4 inches (70 mm) from each other along the length of compression blocks, and a minimum 1/2 inch (13 mm) from edges of both compression blocks and lateral braces. Fasteners securing compression blocks are allowed to penetrate straps.