Enhanced Fujita Scale Damage Indicators and Degrees of Damage

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

Notes:

  • With hip roof, use upper bound wind speed for degree of damage 4 and degree of damage 6
Table 2. Degree of Damage (DOD) for Expected (EXP), Lower Bound (LB) and Upper Bound (UB)
DODDamage DescriptionEXPLBUB
1Threshold of visible damage10585129
2Loss of roof covering material (less than 20%), gutters and/or awning; loss of vinyl or metal siding127101156
3Broken glass in doors and windows154127183
4Uplift of roof deck and loss of significant roof covering material (20% or more); collapse of chimney; garage doors collapse inward; failure of porch or carport156130187
5Entire house shifts off foundation195166227
6Large sections of roof structure removed; most walls remain standing196167229
7Exterior walls collapsed212182246
8Most walls collapsed, except small interior rooms245204286
9All walls collapsed274229319
10Destruction of engineered and/or well-constructed residence; slab swept clean322266354

*All wind speeds in km/h

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