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Old 12 May 2017, 10:47 PM
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GenYus234 GenYus234 is offline
 
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Quote:
Originally Posted by RichardM View Post
The speed of falling hailstones depends on their size. Marble-size hail falls at around 20 mph; baseball-size hail can exceed 100 mph.
Some quick Google-work shows that the test they show appears to be the standard FM 4473 test for rigid roofing materials like slate, concrete, or clay.

ETA: No damage from a 2 inch ice ball is the highest level the standard covers and that's what the test is said to be.
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