Enhanced Fujita scale damage indicators and degrees of damage, chapter 14

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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

Table 14. Degree of Damage (DOD) for Expected (EXP), Lower Bound (LB) and Upper Bound (UB)
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

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Date modified:: 2014-05-07