Wind Damage
Wind damage typically begins at the areas of the roof with the greatest uplift forces due to aerodynamic effects: ridges, windward roof corners, windward eaves, leeward sides of ridges, and windward rakes. Greater wind speeds, and hence, greater wind-generated forces, are found higher above the ground. The exposure of the building plays a large role in the wind forces a roof experiences, such as the surrounding terrain, vegetation, and other buildings. Wind-generated forces lift unbounded shingles and even debond marginally sealed shingles. Shingles can be bent upslope and creased along upslope edges of exposures, or torn away completely. Still stronger winds can tear away areas of shingles from slopes.
Sometimes, wind damage reveals fastening problems. A shingle installed with too few or improperly placed nails or staples can be more easily damaged by wind.
