Enhanced Fujita scale damage indicators and degrees of damage, chapter 14
Automobile Service Buildings (ASB)
Typical Construction:
- Typically one storey with flat roof and relatively tall walls with parapet
- Roof coverings are typically BUR with gravel or single-ply membrane
- Roof structure is light steel framing or open web steel joists and metal roof deck
- Exterior walls are concrete masonry or pre-cast tilt-up panels
- Numerous large metal overhead doors
| DOD | Damage Description | EXP* | LB* | UB* |
|---|---|---|---|---|
| 1 | Threshold of visible damage | 100 | 75 | 125 |
| 2 | Loss of roof covering (up to 20%) | 125 | 105 | 160 |
| 3 | Failure of large overhead doors | 145 | 125 | 175 |
| 4 | Uplift of some roof decking; significant loss of roofing material (more than 20%); loss of rooftop HVAC | 160 | 130 | 190 |
| 5 | Collapse of non-bearing masonry or tilt-up walls | 185 | 150 | 215 |
| 6 | Uplift or collapse of roof structure | 195 | 165 | 230 |
| 7 | Collapse of load-bearing walls | 205 | 170 | 240 |
| 8 | Complete destruction of all or a large section of the building | 255 | 220 | 290 |
*All wind speeds in km/h