Wind Damage

Strong winds can provide a substantial amount of damage to roofing systems. Generally, they are not designed to withstand winds of hurricane or tornado intensity.
However, roofs may also be damaged by winds of moderate intensity, with gusts that may reach 50 to 75 miles per hour.

Mostly, this is caused by the partial vacuum created by wind blowing over the edge of the roof. Nature tries to neutralize the low-pressure area by bringing in air from a higher pressure area, usually from inside the building. This air pushes up on the bottom side of the roof assembly and, over time, loosens fasteners and breaks the adhesion making the roof more susceptible to damage from the next moderate or strong wind.

To counteract the effects of wind-uplift forces, the roofing and insulation should be adequately fastened to the roof deck, and a securely-fastened perimeter detail should be provided.