R Factor for Non-Building Structures
| Structure Type | R |
| 1. Vessels, including tanks and pressurized spheres, on braced or unbraced legs. | 2.2 |
| 2. Cast-in-place concrete silos and chimneys having walls continuous to the foundations. | 3.6 |
| 3. Distributed mass cantilever structures such as stacks, chimneys, silos and skirt-supported vertical vessels. | 2.9 |
| 4. Trussed towers (freestanding or guyed), guyed stacks and chimneys. | 2.9 |
| 5. Cantilevered column-type structures. | 2.2 |
| 6. Cooling towers. | 3.6 |
| 7. Bins and hoppers on braced or unbraced legs. | 2.9 |
| 8. Storage racks. | 3.6 |
| 9. Signs and billboards. | 3.6 |
| 10. Amusement structures and monuments. | 2.2 |
| 11. All other self-supporting structures not otherwise covered. | 2.9 |