Shingle Ratings 1, 2, 3, and 4 Explained: What Charlotte Homeowners Should Buy

Class 1, 2, 3, and 4 on asphalt shingles are UL 2218 hail-impact ratings — Class 4 is the highest — and for most Charlotte homeowners buying a new asphalt roof, a Class 4 architectural shingle is the rating worth specifying. These numbers are not fire ratings, not wind ratings, and not a 1-to-4 quality score. A Class 4 shingle passed the highest-energy version of that laboratory steel-ball test; Class 1–3 passed only lower-energy versions. It is still not hail-proof, and some North Carolina insurers may offer a premium credit for a documented Class 4 roof — confirm that with your agent before you buy.

The rating only describes how that shingle performed in one lab test. Real storms throw hail of different sizes, hardness, and angles, plus wind-driven debris. Installation, roof pitch, decking, and whether the ridge and starter pieces are also impact-rated all change how a roof actually holds up. That is why two "Class 4" bids can still be different jobs, and why the spec sheet is only the start of what you should look at.

What UL 2218 Class 1–4 actually measures

UL 2218 is Underwriters Laboratories' standard for impact resistance of prepared steep-slope roof coverings — shingles, tiles, and similar overlapping products. In the test, steel balls are dropped onto a sample at vulnerable spots (edges, corners, unsupported areas). The product is hit twice in nearly the same place. To pass a class, it must show no tearing, fracturing, or cracking through the shingle that is visible from the underside.

Surface granule loss or a cosmetic dent on the face can still be a pass. The test is looking for a break that would let water through, not a roof that looks untouched.

Class 1 vs. Class 2 vs. Class 3 vs. Class 4

Independent testing summaries of UL 2218 (including published work from Haag Engineering / IIBEC) describe the four classes this way:

Class 4 is the one to ask for if you want the highest rating this standard offers. Class 1–3 products exist, and many everyday architectural shingles are not marketed with a UL 2218 class at all. "Impact resistant" in a brochure is not the same as a printed UL 2218 Class 4 listing.

Do not confuse this with 3-tab shingles. Three-tab is an older, thinner shingle style — not Class 3.

Important limit: steel balls are not hail

UL's own standard states there is no established direct correlation between steel-ball results and every real hailstone. Steel is denser than ice; the test is a repeatable comparison, not a promise that a 2-inch hailstone will leave your roof unharmed.

A related lab method, ANSI FM 4473, uses ice balls instead of steel and uses the same Class 1–4 labels. You may see either standard on a spec sheet. For homeowner decisions in Charlotte, the practical question is still: is this product listed as UL 2218 Class 4 (or equivalent documented Class 4), and will my insurer accept that documentation?

Other ratings people mix up with 1, 2, 3, and 4

When you compare shingles, you will see several different "classes." They are not interchangeable.

A shingle can be fire Class A, wind Class H, and impact Class 4 at the same time — or only some of those. Read the spec sheet line by line.

What Charlotte homeowners should look at before they buy

Use this as a checklist, not a sales script.

1. The UL 2218 class on the spec sheet. Ask for the product name and the class in writing. If the bid only says "architectural" or "impact resistant," that is not enough.

2. Matching accessories. Field shingles, ridge cap, hip, and starter are different pieces. A Class 4 field shingle with non-rated ridge cap is not a full Class 4 covering. Ask whether the system is Class 4, not only the shingle you see from the street.

3. Wind and fire listings for the same product — typically Class A fire and a published wind classification on premium architectural lines.

4. Your insurer, before installation. Some North Carolina carriers offer a credit for a documented Class 4 roof; others do not, and the amount and paperwork vary. Call your agent with the product name. Ask what certificate they need. ARX can provide manufacturer and installation documentation; the insurer decides any credit.

5. The rest of the roof system. Class rating does not replace tear-off, underlayment, flashing, and ventilation. Poor ventilation and reused flashing fail expensive roofs every year in this climate.

6. Who installs it. North Carolina requires a licensed general contractor when the contract is $40,000 or more. Verify the license at nclbgc.org. ARX holds NC license #108723. A high rating installed off-spec can void a manufacturer warranty.

7. How long you will own the home. Class 4 asphalt still has a typical Charlotte service life in the architectural range — see our materials comparison and shingles vs. metal if you are weighing a longer-lived metal roof instead.

Does Class 4 cost more, and is it worth it here?

Class 4 architectural shingles typically cost more than a standard architectural line on the same roof. Our 2026 installed ranges for the Charlotte metro put everyday architectural asphalt roughly in the $9,000–$20,000 band and impact-rated (Class 4) asphalt roughly in the $11,000–$24,000 band for typical single-family homes — ranges, not quotes; size, pitch, and complexity move both. See roof replacement cost in Charlotte.

Whether the upgrade is "worth it" depends on hail exposure, how long you will stay, and whether your carrier actually credits Class 4. Charlotte's warm-season thunderstorms can include hail. ARX's working recommendation for most asphalt replacements here is to look at a Class 4 option in the line that fits the house — IKO is our primary shingle line, with GAF, Owens Corning, and CertainTeed available on request. We will not tell you Class 4 makes the roof immune to storms. If a standard architectural shingle is the honest fit for budget and a short remaining ownership, we will say that too.

What to do next

If you are comparing bids, put the shingle product name and UL 2218 class next to each other on paper, then compare the rest of the scope. For a ballpark asphalt range, ARX Instant Estimate uses satellite imagery and returns an estimate only — not a quote. For a written scope, product options including Class 4, and documentation your insurer may ask for, book a free on-site inspection or call (704) 313-8834. ARX Roofing & Exteriors serves Charlotte, Concord, Huntersville, Mooresville, and the surrounding metro.

Frequently Asked Questions

What does a Class 4 shingle rating mean? It means the shingle passed the UL 2218 Class 4 steel-ball impact test — a 2-inch ball dropped from 20 feet, twice in the same area — without a through-crack visible from the underside. It is the highest class in that standard.

Is a Class 4 roof hail-proof? No. UL 2218 is a laboratory comparison using steel balls. Large hail, repeated hits, and wind-driven debris can still damage a Class 4 roof. The rating improves resistance; it does not eliminate storm damage.

Will Class 4 shingles lower my insurance in North Carolina? Sometimes. Some carriers offer a premium credit for a documented UL 2218 Class 4 roof; others do not. Amounts and required paperwork vary. Confirm with your agent before you purchase. ARX can supply product and installation documentation; the insurer decides the credit.

Are Class 1, 2, and 3 shingles bad? They passed a lower-energy impact test than Class 4, or they may simply be unlabeled. They are not a "failing" grade. For a new Charlotte asphalt roof, Class 4 is the class most homeowners should ask about if hail and possible insurance credit matter to them.

Is fire Class A the same as impact Class 4? No. Fire Class A (ASTM E108 / UL 790) measures flame spread. Impact Class 4 (UL 2218) measures a steel-ball hit. Ask for both listings on the spec sheet.

Does every piece of the roof need to be Class 4? If you want a Class 4 covering, ask that field shingles and the matching ridge, hip, and starter products be Class 4 as well. A mixed system is not the same as a Class 4 roof covering.

Should I get Class 4 or metal instead? They solve different problems. Class 4 asphalt is still an asphalt roof with a typical architectural lifespan. Standing seam metal lasts longer and handles wind and rain exceptionally well, but it costs more upfront and can dent from hail even when it does not leak. See architectural shingles vs. metal.

Sources

*This guide is general information, not a quote or insurance advice. UL 2218 class, wind, and fire listings vary by product. Confirm ratings on the manufacturer's spec sheet, confirm any insurance credit with your carrier, and confirm pricing with an on-site inspection.*