Degree
of
Damage
Damage
Description
EXPECTED
WIND SPEED
LOWEST
WIND SPEED
HIGHEST
WIND SPEED
1
Threshold of
visible damage
65
53
80
2
Loss of roof covering material (<20%), gutters and/or awning; loss of
vinyl or metal siding
79
63
97
3
Broken glass in
doors and windows
96
79
114
4
Uplift of roof deck and loss of significant roof covering material (>
20%); collapse of chimney, garage doors collapse inward, failure of
porch or carport
97
81
116
5
Entire house
shifts off foundation
121
103
141
6
Large sections of
roof structure removed; most walls remain standing
122
104
142
7
Exterior walls
collapsed
132
113
153
8
Most walls
collapsed, except small interior rooms
152
127
178
9
All walls
collapsed
170
142
198
10
Destruction of
engineered and/or well constructed residence, slab swept clean
200
165
220
Estimating
the EF scale rating from damage to a one or two family residence
(Indicator 2 in Table 19.2)