What is damaging wind?
Damaging winds are often called “straight-line” winds to differentiate the damage they cause from tornado damage. Strong thunderstorm winds can come from a number of different processes. Most thunderstorm winds that cause damage at the ground are a result of outflow generated by a thunderstorm downdraft. Damaging winds are classified as those exceeding 50-60 mph.
What is wind damage?
Wind doesn’t have to be that strong to cause roof damage. Gusts of wind at 75 to 85 miles per hour can easily raise the shingles off of your home in a second, exposing your roof to possible rain & water damage. Not all damage is visible (like the following pictures show) but all damage will result in leaks and further damage if left unrepaired.
How does wind damage happen?
When wind passes over and around a building, it generates inward or outward pressures on the walls and inward or outward (uplift) pressures on the roofs. Inward (positive) pressures are generated on the windward side of the building as the wind blows against a wall or roof surface, such as a steep roof. This positive pressure does not damage shingles unless the tabs are lifted such that the pressure can get under the tab. Outward (negative/suction/uplift) pressures are generated when the wind passes by a wall, passes away from a wall (leeward side of the building, that is, the side not facing the wind), passes over a shallow sloped roof, or passes over the leeward slope of the roof. It is this negative or suction pressure that lifts a tab or a shingle strip. The magnitude of the positive or negative/suction pressures on the shingles of a building is determined not only by the speed of the wind, but also by the orientation of the roof slope to the direction of the wind and the location of the shingles on the roof slope.
Where is wind damage?
Wind damage can occur over any area of the roof. But most wind damage that occurs on a roof start on the edge of the roof system. Anywhere material is even a little bit loose, the suction of the wind is going to raise it up and then the wind can get below it and push it up. Once the underside of the roofing is exposed, rain can get in, but it also gives the wind more to grab on to.
Tips on preventing damage:
There really isn’t any way to prevent wind damage. Any roof is susceptible to damage from wind. Once your roof has damage it is imperative to get the damage assessed and repaired. If you suspect you have wind damage it is imperative to call as soon as possible to get the damage assessed properly. Berlet Roofing is here to assess your wind damage and get you on the road to recovery as soon as possible.
Call (970)846-9816 today for your free inspection!