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
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