What I am really most concerned about is durability against hail, which we get several times a year. Fortunately not often larger than pea size, but we get pea or dime hail several times a year and there is a risk of golfball, baseball, or even softball size.
That is because the roofing industry has shifted from "weight" ratings to expected shingle life for their shingles. Not many use weights anymore, but here is an explanation that may help you:
Like Rich256 said, if you're looking for durability against hail in an asphalt shingle, look for a UL Class 4. Here's a link to the ones State Farm approves for a premium credit:
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I don't see any Tamko listed.
One other thing you might consider in choosing a shingle is wind resistance but maybe it will be tough enough to find an impact-resistant one both you and your roofer like.
Ahah, a clue! After some calling around I found out a bunch of important stuff.
UL 2218 is the destructive testing standard used to classify roof products for impact resistance. Impact can involve hail, falling tree limbs and pinecones etc, and tornado debris. Class 4 is the best.
Tamko asphalt shingles are not classified for impact resistance. That does not mean their impact resistance would be poor. My ins co lists about 10 asphalt single products that are Class 3 or 4 and *may* qualify for an insurance discount in my region. I will research those.
The main difference between the two Tamko shingles proposed by my roofer is the warranty.
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