The wind resistance of shingles

Revisions are necessary to accommodate new standards and codes for asphalt shingle wind resistance

Unlike membrane roof systems, which are designed for wind uplift based on uplift-resistance pressures, asphalt shingle roof systems are classified based on wind speeds. Following is a brief overview of the wind-resistance methodologies applicable to asphalt shingle roof systems.

ASTM D3161

ASTM D3161, "Standard Test Method for Wind-Resistance of Asphalt Shingles (Fan-Induced Method)," evaluates the wind resistances of discontinuous, air-permeable, steep-slope roofing products, including asphalt shingles, by delivering a stream of air across test deck specimens. A minimum of two test specimens are subjected to test velocities of 60-, 90- or 110-mph winds for two hours. During the tests, the test specimens are observed for any damage, including disengagement of a sealed tab. Test specimens exhibiting damage are considered to have failed the test.

Asphalt shingle test specimens passing the two-hour test duration at 60 mph are classified as Class A; those passing at 90 mph are classified as Class D; and those passing at 110 mph are classified as Class F.