Enhanced Fujita scale damage indicators and degrees of damage, chapter 8
Small Retail Buildings (SRB)
Typical Construction:
- Flat, hip, gable, mansard or mono-slope roof
- Asphalt shingles, metal panels, slate, tile, single-ply or BUR roof covering
- Plywood/OSB roof decking
- Wood or metal roof structure consisting of trusses or rafters and joists
- Wood or metal stud walls
- Typically have large areas of window glass and double entry doors
- Canopies, covered walkways or porches
- Wood, brick veneer, metal or vinyl siding, concrete blocks, EIFS or stucco wall cladding
- Best example is fast-food restaurant
Notes:
- With hip roof, increase toward upper bound wind speed for Degree of Damage 4 (DODx) and DOD6
| DOD | Damage Description | EXP* | LB* | UB* |
|---|---|---|---|---|
| 1 | Threshold of visible damage | 105 | 85 | 130 |
| 2 | Loss of roof covering (up to 20%) | 125 | 105 | 160 |
| 3 | Broken glass in windows and doors | 140 | 115 | 165 |
| 4 | Uplift of roof decking; significant loss of roof covering (more than 20%) | 160 | 130 | 190 |
| 5 | Canopies or covered walkways destroyed | 160 | 135 | 185 |
| 6 | Uplift or collapse of entire roof structure | 190 | 165 | 225 |
| 7 | Collapse of exterior walls; closely spaced interior walls remain standing | 220 | 195 | 255 |
| 8 | Total destruction of entire building | 270 | 230 | 310 |
*All wind speeds in km/h