WARNING: JOISTS ARE UNSTABLE UNTIL BRACED LATERALLY BRACING INCLUDES: Blocking, Hangers, Rim Board, Sheathing, Rim Joist, Strut Lines Lack of proper bracing during construction can result in serious accidents. Observe the following guidelines: 1. Properly install all blocking, hangers, rim boards, and rim joists at TJI ® joist end supports. 2.