For the structures listed below, damage assessors use detailed tables that describe the degree of damage, together with example photographs from damaged structures to establish the likely wind speed and EF scale rating for a tornado
No.
Damage Indicator
1
Small Barns or Farm Outbuildings
2
One or Two Family Residences
3
Manufactured Home – Single Wide
4
Manufactured Home – Double Wide
5
Apartments, Condos, Townhouses
6
Motel
7
Masonry Apartment or Motel
8
Small Retail Building
9
Small Professional Building
10
Strip Mall
11
Large Shopping Mall
12
Large Isolated Retail Building
13
Automobile Showroom
14
Automobile Service Building
15
Elementary School
16
Junior or Senior High School
17
Low-Rise Building (1-4 stories)
18
Mid-Rise Building (5-20 stories)
No.
Damage Indicator
19
High-Rise Building (> 20 stories)
20
Institutional Building
21
Metal Building System
22
Service Station Canopy
23
Warehouse Building
24
Electrical Transmission Lines
25
Free Standing Towers
26
Free Standing Light Poles, Luminary Poles, Flag Poles
27
Trees (Hardwood)
28
Trees (Softwood)
Damage Indicators for establishing EF-Scale ratings