| 52 / | HD | STATIC STRUCTURES (E.G., BUILDINGS) |
| 415 | DF | FACERS; E.G., MODULES, MUTUALLY BONDED BY INTERNAL SETTABLE MATERIAL SECTION {13} |
| 424 | DF | .~ Laterally related modules; e.g., back-to-back {6} |
| 425 | ![]() | .~.~ Continuous section filling space between modules {1} |
| 426 | DF | .~.~.~> With transverse tie |