Enhanced Fujita scale damage indicators and degrees of damage, chapter 2

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One- or Two- Family Residences: 100-500m2 (FR12)

Typical Construction:

Asphalt shingles, tile, slate or metal roof covering
Flat, gable, hip, mansard or mono-sloped roof or combinations thereof
Plywood/Oriented Strand Board (OSB) or wood plank roof deck
Prefabricated wood trusses or wood joist and rafter construction
Brick veneer, wood panels, stucco, Exterior Insulation and Finish Systems (EIFS) vinyl or metal siding
Wood or metal stud walls, concrete blocks or insulating-concrete panels
Attached single or double garage

Notes:

Includes modular homes; if unanchored, use lower-bound wind speed for Degree of Damage 5 (DODx).
With hip roof, increase toward upper-bound wind speed for DOD4 and DOD6

Table 2. 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	105	85	130
2	Loss of roof covering material (up to 20%), gutters and/or awning; loss of vinyl or metal siding	125	100	155
3	Broken glass in doors and windows	155	125	185
4	Uplift of roof deck and loss of significant roof covering material (more than20%); collapse of chimney; garage doors collapse inward; failure of porch or carport	155	130	185
5	Entire house shifts off foundation	195	165	225
6	Large sections of roof structure removed (more than 50%); most walls remain standing	195	165	230
7	Exterior walls collapsed	210	180	245
8	Most walls collapsed, except small interior rooms	245	205	285
9	All walls collapsed	275	230	320
10	Destruction of engineered and/or well-constructed residence; slab swept clean	320	265	355

*All wind speeds in km/h

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Date modified:: 2014-05-07