Class 4 Impact Shingles Reach Michigan: A Market Note
A shingle wrapper that once only mattered in Texas hail country now shows up on distributor racks in Macomb County: Class 4. Here is what that rating actually measures, why the product line moved this direction, and the honest limits of what it promises.
Ten years ago, a homeowner asking for a Class 4 impact resistant shingle was almost always calling from hail alley: Texas, Oklahoma, Kansas, Nebraska. That request now comes up in Macomb County too, often because a homeowner read about the rating online or saw it on a sample board at a distributor. This note is about the rating itself, not a pitch for one product line: what UL 2218 actually tests, why the product spread this far north, and what the Class 4 label does and does not promise on a Michigan roof.
01 /What UL 2218 actually measures
UL 2218 is a laboratory test, not a marketing term. See UL 2218, the Standard for Impact Resistance of Prepared Roof Covering Materials. It drops a steel ball from a fixed height onto a shingle sample and checks the underside of the mat for a crack or tear after impact. The ball size and drop height step up through four classes, and a product earns the class it survives without fracturing. Class 4 is the top rung: a two inch steel ball, the size of a large hailstone, dropped from twenty feet, with no visible crack on the back of the shingle afterward. That is the entire test. It says nothing about wind rating, algae resistance, or how the shingle will look ten years from now; it is a single, specific measure of impact toughness under one controlled condition.
02 /Why the rating spread beyond hail alley
Impact resistant shingles were developed and first sold hardest where hail losses were largest and most frequent, which put the early product lines squarely in the central and southern plains. Manufacturers built the reinforced mats and polymer modified asphalt that pass Class 4 for that market first. Over time, several of the larger shingle makers have folded Class 4 options into their broader architectural lines rather than keeping them as a regional special order, which is the ordinary way a product matures: what starts as a niche SKU for one region becomes a standard catalog choice once the manufacturing line already exists. Michigan sits well outside hail alley by frequency, but it is not hail free, and a shingle that already exists on the price sheet is an easy option for a distributor to stock and a roofer to offer, whether or not the buyer's specific street sees hail often.
A Class 4 rating means a shingle passed one laboratory drop test without a visible crack. It does not mean the shingle cannot be damaged, that granules will not dislodge in a real storm, or that a large enough hailstone at the wrong angle cannot still bruise it. Treat the rating as a meaningfully tougher shingle, not an unbreakable one.
03 /The insurance discount question
The question we hear most about Class 4 shingles is whether installing them lowers a homeowner's insurance premium. The honest answer is that it can, in some cases, but not automatically and not everywhere. See the Insurance Information Institute. Some insurers in hail exposed states offer a credit or discount for a documented Class 4 roof, and some do not offer one at all; where a discount exists, the size and eligibility rules are set by that carrier and that state, not by us and not by the shingle manufacturer. We are not able to tell a Macomb County homeowner what their specific policy will do, and we will not promise a savings figure we cannot verify. The only reliable way to answer that question for your own policy is to ask your own carrier or agent directly, before or after the reroof, and get the answer in writing.
04 /What it means for a Macomb County quote
Class 4 shingles are still asphalt shingles, and they still fall inside our published replacement range of $9,000 to $18,000, with most homes landing at $12,000 to $16,000 depending on size, pitch, and material tier. Choosing an impact rated product is one factor that can move a quote toward the upper end of that asphalt range, alongside roof size, pitch, layers to remove, and ventilation work, not a separate price category of its own. If a hailstorm already damaged the roof you have now, the size of hail that can bruise a shingle is its own subject, covered in our note on what size hail damages a roof. If it is a new build or a planned reroof and you are simply weighing whether the upgrade is worth it, our 60 second cost calculator works from the same canon ranges, and a free, no obligation inspection turns any of this into a firm written number, Class 4 or standard, for your specific roof.
None of this changes what to do after an actual storm. Hail response, damage documentation, and working with an adjuster belong to our storm damage service page and our storm damage and insurance claims guide, not to a shingle rating. This note is about the product on the shelf before the storm, not the process after one.
- UL 2218, Standard for Impact Resistance of Prepared Roof Covering Materials: the steel-ball drop test behind Class 1 through Class 4 impact ratings.
- Insurance Information Institute, consumer explainers on homeowners policy coverage, deductibles, and the claims process. iii.org