Enhanced Fujita scale damage indicators and degrees of damage, chapter 29

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C-4 Solid Masonry Houses (C-SMH)

Typical Construction:

Asphalt shingles, tile, slate or metal roof covering
Flat, gable, hip, mansard or mono-sloped roof or combinations thereof
Plywood/OSB or wood plank roof deck
All exterior walls are solid masonry construction (e.g. double brick)
Roof is wood joist and rafter construction

Notes:

With hip roof, increase toward upper-bound wind speed for Degree of Damage 4 (DODx) and DOD5

Table 29. 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 than 20%); collapse of chimney; garage doors collapse inward; failure of porch or carport	155	130	185
5	Large sections of roof structure removed (more than 50%); most walls remain standing	195	165	240
6	Exterior walls collapsed	245	210	285
7	Most walls collapsed, except small interior rooms	285	245	325
8	Complete destruction of building	315	275	355

*All wind speeds in km/h

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Date modified:: 2014-05-07