Class 3 vs Class 4 Shingles: What the Ratings Mean in Florida

Class 3 vs Class 4 shingles explained: how UL 2218 testing works, what the ratings cover, the cost gap, and what Tampa Bay homeowners should check first.

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Class 3 vs Class 4 Shingles: What the Ratings Mean in Florida

Class 3 vs Class 4 Shingles: What the Ratings Mean in Florida

Homeowner and roofer compare asphalt shingle samples

💬 Hi, I’m the Hytz Roofing assistant. Short answer first: Class 4 is the higher impact rating. Class 3 shingles pass the UL 2218 test with a 1.75-inch steel ball, and Class 4 shingles pass it with a 2.00-inch ball. Both ratings are about impact, not wind. In Florida, wind rating, product approval and installation matter just as much as the class number. Let’s walk through it.

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TL;DR

  • 📋 Class 3 passes two same-spot hits from a 1.75-inch steel ball. Class 4 passes two hits from a 2.00-inch ball. Class 4 is the top class.
  • 💲 In an IBHS survey, shingles with good impact performance cost about 9% more per roofing square on average. The gap varied by market.
  • 🌀 Impact and wind are tested separately. A Florida roof needs a wind rating and the right product approval too.
  • 🏠 Insurance credits in Florida come from wind mitigation features confirmed on an inspection form, not from the class number alone.
  • 🚨 Want a second set of eyes on your roof? Request a roof inspection.

Table of Contents

What Class 3 and Class 4 actually mean

The classes come from UL 2218, an impact test for roof coverings. Technicians drop steel balls onto the shingle. The ball size goes up with each class. UL 2218 uses 1.25 inches for Class 1, 1.50 for Class 2, 1.75 for Class 3 and 2.00 for Class 4.

UL 2218 steel-ball sizes by shingle class

To earn a rating, the shingle takes two impacts in the same spot. Then the back is checked. Class 3 and Class 4 both require no visible crack on the back of the shingle.

Here is the side-by-side:

Class 3 Class 4
Steel ball diameter 1.75 inches 2.00 inches
Drop height 17 feet 20 feet
Hits per spot Two Two
Pass standard No cracking, tearing or fracturing on the back Same
Rank Third of four Highest

So the difference is a bigger, heavier-hitting ball. Class 4 shingles are built to take more energy before the mat cracks. IBHS notes impact resistance often comes from a reinforcing scrim or polymer-modified asphalt, and that approach is becoming more common.

What the rating does and doesn’t tell you

A class number is a useful, standardized yardstick. It helps to know exactly what it measures, so you can use it well.

It measures structural breach

UL 2218 judges physical breach damage seen from the back of the shingle. It does not score denting or granule loss, the things a homeowner or adjuster can see from the ground. Surface dents, scuffs or granule loss are not failures under the test.

Impact breach visible on a shingle underside

It is a lab result

Laboratory tests give useful performance information but do not fully replicate real-world conditions. Real hail varies in size, speed and angle. The rating also does not by itself guarantee hail coverage under a warranty, so read the warranty terms for the product you pick.

Newer testing looks at more

IBHS built a newer protocol that uses laboratory-made hailstones and evaluates dents, tears and granule loss. In its November 2025 results, it tested 24 impact-resistant products, about 95% of those sold annually. They were rated Excellent, Good, Marginal or Poor. Most landed at Good and none at Excellent. The takeaway: the product you choose matters, and a class stamp is one data point among several.

You may also see FM 4473, another standard. It launches ice balls pneumatically and classes materials from 1 to 4. Same idea, different method.

How much more does Class 4 cost?

Less than many homeowners expect. In an IBHS cost survey across seven U.S. markets, shingles with Good or Excellent impact performance cost 9% more per roofing square on average. The survey showed regional swings, with 2% more in Oklahoma City and 4% in Dallas-Fort Worth.

That is a survey of materials, not a quote for your home. Your total depends on roof size, pitch, deck condition, tear-off, and the product line. For context, our published ranges for a full replacement run from $9,000 to $30,000. Our cost guide explains what moves a price up or down.

A practical way to think about it: material is only part of a replacement bill. Labor, underlayment, flashing and disposal are the rest. A modest material premium often changes the total less than people fear.

Wind is a separate test, and Florida is a wind state

This is the part many national guides skip. UL 2218 is about impact. Wind resistance is evaluated separately under ASTM D7158 or D3161. TAS 100 evaluates wind and wind-driven-rain resistance and can be used to judge suitability in hurricane regions.

So a Class 4 shingle is not automatically the best hurricane shingle, and a Class 3 shingle is not automatically weak in wind. Look at both ratings on the product data sheet.

Installation counts too. IBHS says stronger roof-deck attachment, a sealed roof deck and locked edges add wind protection. Those are details of how the roof is built, not which class is printed on the bundle.

Before buying a Class 4 product in Florida, read our guide on how to verify the NOA and wind rating before buying Class 4 shingles. It covers the paperwork to ask for.

Do Class 4 shingles lower your insurance premium in Florida?

Possibly, but the class number is not the whole story. Florida law requires insurers to offer discounts for wind mitigation features, which can include certain roof coverings. A qualified inspector completes a Uniform Mitigation Verification Inspection form. It confirms features such as deck attachment and secondary water barriers. Those features, together with the roof covering, set the final credit.

The same state guide says homes built to the 2001 Florida Building Code or later (or the 1994 South Florida Building Code in Miami-Dade and Broward) are automatically eligible for a minimum 68% discount on windstorm coverage. If your roof is newer, you may already be getting credit.

Ask your insurer what it credits before you decide. Then see how to claim wind mitigation credits at roof replacement and what a wind mitigation inspection involves.

When Class 3 or Class 4 makes sense

There is no single right answer. Here is how I’d frame the choice for a Tampa Bay home. 🏠

Class 4 is a strong fit when:

  • You want the highest impact rating available on an asphalt shingle.
  • You are replacing the roof anyway and want to build in the extra margin.
  • Your insurer or a mitigation inspection confirms the product earns you something on your policy.
  • Your property has trees nearby that drop heavy limbs and debris in storms.

Class 3 is a strong fit when:

  • You want a rated, impact-tested shingle at a lower material cost.
  • Your priority is the wind rating, deck attachment and underlayment, and you want to spend your budget there.
  • Your insurer does not credit the higher class and you are working to a firm budget.

A five-point checklist before you choose

  1. Read both ratings. Find the UL 2218 class and the wind classification on the product data sheet.
  2. Confirm the Florida approval. Ask for the product approval or NOA where your jurisdiction requires it.
  3. Check the warranty. See what it covers for hail, wind and workmanship, in writing.
  4. Ask your insurer. Learn which roof features earn a credit on your policy.
  5. Plan the install. Deck attachment, sealed deck and edge details protect the roof in a hurricane.

What about tile, metal and other options?

Shingle class is only one path. If you are weighing materials, our metal roofing projects are published at $15,000 to $45,000, and tile roofing at $18,000 to $50,000. We also have a guide on how tile performs in hurricanes, where installation matters more than tile type. For a wider look, see our alternative roofing materials guide.

Prepare the roof and the house before storm season

A good roof is one layer of hurricane readiness. Protecting what is inside is another. If you are packing up valuables during a re-roof or ahead of a storm, this guide on how to prepare your belongings for hurricane season is a handy checklist. Pair it with a roof check so both are ready before a storm is in the forecast. 🌀

After a storm, document damage quickly. Our guides on wind-damaged shingles and storm damage repair costs show what to look for and do.

Perspective

Here is how we see Class 3 vs Class 4 after years of roofing Tampa Bay homes.

The class number is a good starting point, and Class 4 is the highest impact rating on the label. We like homeowners who ask about it, because it means they are thinking about protecting the roof.

But in Florida the roof that performs is the one that is built right as a system. That means the right wind rating, the right product approval, a properly fastened deck, quality underlayment and clean flashing. As a GAF Master Elite® Contractor, a status held by fewer than 2% of roofing contractors in North America, we install to manufacturer specifications and back the work with manufacturer warranties.

Our advice: pick the shingle on both ratings, ask your insurer what it credits, and let a licensed crew handle the installation. We provide itemized estimates so you can see exactly what each choice adds.

Anthony

Ready for a plan for your roof?

📋 We serve homeowners and commercial property owners across Tampa Bay and Central Florida. We offer roof inspections, repair, replacement and insurance claim assistance, plus wind mitigation inspections. Our work is backed by Florida Contractor License #CCC1332551, liability and workers’ compensation coverage, and manufacturer-backed warranties.

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Start with a roof inspection and estimate, or see our roof replacement process. Got storm damage? 🚨 Our storm damage roof repair team can help, and we can assist with your insurance claim.

FAQ

Is Class 4 always better than Class 3?

Class 4 is the higher impact rating, since it passes a test with a larger steel ball. Better overall also depends on the wind rating, the warranty and how the roof is installed. Compare all of those on the product data sheet.

Are Class 4 shingles hail-proof?

No shingle is. The rating means the shingle passed a lab test with no cracking on the back. It does not guarantee hail immunity or prevent cosmetic damage. It is a strong sign of impact performance, not a promise about every storm.

Will a Class 4 roof lower my Florida insurance premium?

It may, but Florida credits come from wind mitigation features confirmed on the Uniform Mitigation Verification Inspection form. Ask your insurer which roof features it credits. A qualified inspector can document your roof’s features.

How do I know what class my current shingles are?

Check the product name on your original invoice, permit or warranty paperwork, then look up its data sheet from the manufacturer. If you can’t find it, an inspector can help identify the product. We can do this during a roof inspection.

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