Class 4 Impact-Resistant Shingles: Are They Worth It on a Royse City Roof?

Here is the part the shingle brochures leave out: the hail-safety program run by the insurance industry's own research institute says many impact-resistant shingles do not perform as expected in real-world storms. That matters if you are pricing Class 4 impact-resistant shingles for a home in Royse City, because Class 4 is the label homeowners are told to buy after a storm and the one Texas insurers point to for premium credits. Whether it is worth it depends on which product carries the label, what your insurer will credit, and how long you plan to stay.

Key Takeaways

What does a Class 4 rating actually measure?

A Class 4 rating means a roofing product survived the largest steel ball in the UL 2218 impact test without cracking through. The Insurance Institute for Business & Home Safety describes UL 2218 as a steel ball drop test with four ball sizes: 1.25 inches for Class 1, 1.5 inches for Class 2, 1.75 inches for Class 3 and 2 inches for Class 4. Each ball is dropped from the height needed to match the energy of a hailstone of the same diameter.

The pass rule is narrow. A sample fails only if there is evidence of tearing, fracturing, cracking or rupturing on the back of the shingle. Granule loss, dents and marks visible only on the top surface do not count against the product. So a Class 4 shingle is one that resists punch-through, which is a meaningful property, but it is not a promise that the roof will look untouched after a storm or that an adjuster will find nothing to write up.

Why can a Class 4 shingle still come through a storm damaged?

Class 4 shingles can still be damaged because the test is a controlled lab comparison, not a replica of a Texas hailstorm. The same IBHS report notes that steel-ball tests do not exactly replicate natural hailstones and that the pass criteria do not necessarily reflect what insurers use to decide on repair or replacement. In that study, none of the products tested, basic or impact rated, passed more than Class 2 impacts without at least one failing location.

Size is the other problem. Hail in this region can exceed two inches, as the Wylie storm below shows, and once a stone is larger and heavier than the test ball, the rating simply has nothing to say about it. The label sets a floor, and products above that floor are not equal.

That gap is why IBHS now buys shingles off retail shelves and rates them with lab impacts designed to mimic natural hail, scoring dents, tears and granule loss. Its FORTIFIED program requires a shingle scored Good or Excellent in those ratings before a home can earn its hail supplement, a sign that the industry itself no longer treats the Class 4 stamp as enough on its own.

How much hail risk does a Royse City roof actually face?

Royse City roofs face serious hail exposure because the town sits in a stretch of North Texas that has produced record-setting hail. On April 11, 2016, a supercell crossed Collin County and hit Wylie, where the National Weather Service in Fort Worth recorded a 5.25-inch hailstone, a record for its forecast area. The agency reported that 80 percent of homes in Wylie were affected and that damage there topped $300 million.

Royse City is a close neighbor to that storm track. The city sits mostly in Rockwall County and extends into both Collin and Hunt counties, with Interstate 30 running just south of town between Rockwall and Greenville. The 2020 census counted 13,508 residents, and every one of their roofs will meet the Class 4 question at its next replacement.

Will a Class 4 roof lower your insurance premium in Texas?

A Class 4 roof may lower your premium, but the amount is set by your insurance company, not guaranteed by the state. The Texas Department of Insurance page on impact-resistant roofing credits states that the discount for each class of roofing material is established by the insurer, and that a Class 4 roof covering receives the highest credit. That page is written for TWIA, the windstorm pool that covers the Texas coast rather than Rockwall County, but its mechanics are a useful guide to what a private carrier may ask for.

Qualifying products carry a label from the testing lab showing the impact class, manufacturer, brand and year of manufacture, and the installing contractor documents the job on TDI form PC068, which an insurer may accept or replace with its own form, so keep both. In September 2026, TDI also issued a commissioner's bulletin urging insurers to offer meaningful, actuarially supported discounts for impact-resistant roofing, but it requires no discount and sets no amount. The only figure that counts is the one your own carrier quotes for your address.

How do standard and Class 4 shingles compare?

This comparison uses only what the cited sources and this site state, and leaves out prices, which depend on the roof and the product line.

When does Class 4 make sense, and when does it not?

Class 4 makes the most sense when you are replacing the roof anyway, plan to stay for years and have an insurer that will put a credit in writing.

Cases where the upgrade usually earns its keep

Cases where it is harder to justify

What should you ask before choosing a Class 4 product?

Ask for the exact product name first, because the product line matters more than the class, then check its IBHS score and confirm the wrapper carries the UL 2218 Class 4 label. After that, call your agent with three questions:

The Insurer's Number Settles It

Make the call to your carrier before you sign a replacement contract. A Class 4 shingle is a real improvement in punch-through resistance, but in Royse City the financial case rests on whether your insurer turns that label into a credit, and how many years you will collect it. Get the credit amount and the required form in writing, compare it against the separate Class 4 line on your estimate, and pick a product that scores well in independent testing rather than one that simply carries the stamp.

If you would like that comparison laid out on your own house, our roof replacement estimates list the Class 4 option on its own line, and a roof inspection will show whether your current roof needs replacing yet. After a storm, start with hail damage roof repair at Royse City Roofing.