What impact-resistant shingle is, and where it is the wrong answer.
An impact-resistant shingle is an asphalt shingle that has survived a laboratory test. UL 2218 drops a steel ball onto the product from a set height, and Class 1 through Class 4 record how large a ball it withstood without the mat splitting. Class 4 is the top step of that scale. The classification describes the test, and nothing beyond it.
Why these properties
These are exposed suburban roofs with wide, unshaded planes turned to open sky — the geometry hail actually reaches. The owners have usually been through one storm already, and are choosing a covering with the next one in mind rather than the last one.
Where it is oversold
The classification is a steel ball dropped indoors, not a promise about a storm. Real hail arrives at an angle, at mixed sizes, with wind behind it, and a Class 4 roof can still be damaged and still need replacing. It buys margin, and anyone selling it as immunity has left the test behind.
What an assessment looks at on this system
01
Whether the product on the roof is the product on the estimate. Class 4 is a line on a product sheet, and after the work closes the wrapper and the delivery ticket are the proof.
02
The accessories. Ridge caps, starter courses and hip shingles are separate products, and a Class 4 field finished with an ordinary ridge leaves the most exposed line on the roof at ordinary strength.
03
The documentation an insurer will want. Texas carriers commonly offer a premium credit for a Class 4 covering, and it is granted against paperwork rather than against the roof, so the paperwork has to exist.
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