Wind resistance is an important performance property of asphalt shingle products and, depending on region, may be a significant consideration for building owners.
Until relatively recently, asphalt shingle products' wind resistances had been determined using a fan-induced wind test. Because of the long-standing nature of this wind test, virtually all asphalt shingle products have been tested and classified on this basis. But recently, a new wind-resistance methodology was developed and is beginning to be implemented. Currently, only a limited number of asphalt shingle products have been tested and are classified according to this new methodology.
There are important considerations you should be aware of if you use asphalt shingle products that are classified based on the new methodology.