Enhanced Fujita scale damage indicators and degrees of damage, chapter 5
Apartments, Condominiums and Townhouses: 3 Storeys or less (ACT)
Typical Construction:
- Flat, gable, hip or mansard roof
- Asphalt shingles, tile, metal or BUR roof covering
- Plywood/OSB (Oriented Strand Board) roof decking
- Light-framed wood or metal roof trusses
- Wood, metal or vinyl panels, stucco brick veneer or EIFS wall covering; combinations of wall coverings
- Wood or metal stud walls; wood floor diaphragms
- Sliding patio doors; balconies
Notes:
- With hip roof, increase toward upper-bound wind speed for degree of damage 3 (DOD3) and DOD4
| DOD | Damage Description | EXP | LB | UB |
|---|---|---|---|---|
| 1 | Threshold of visible damage | 120 | 100 | 155 |
| 2 | Loss of roof covering (up to 20%) | 160 | 130 | 195 |
| 3 | Uplift of roof decking; significant loss of roof covering (more than 20%) | 200 | 170 | 235 |
| 4 | Uplift or collapse of roof structure leaving most walls standing | 220 | 195 | 255 |
| 5 | Most top story walls collapsed | 255 | 220 | 295 |
| 6 | Almost total destruction of top two stories | 290 | 250 | 330 |
*All wind speeds in km/h