Class 3 vs. Class 4 Impact-Rated Shingles in Louisiana
Class 4 is the higher UL 2218 impact rating, but that does not automatically make it the right shingle for every Louisiana home. Class 3 can be a practical value choice, while Class 4 is worth comparing when you want the highest impact class, your insurer recognizes the exact product, or the additional protection justifies the price difference. In both cases, the roof’s wind rating, deck attachment, water barrier, edges, flashing, and ventilation still matter.
Quick Answer
Class 3: tested with a 1.75-inch steel ball under UL 2218 procedures. It offers a higher level of impact resistance than a non-rated product and is now available in several widely used architectural shingle lines.
Class 4: tested with a 2-inch steel ball and is the highest UL 2218 class. It is the stronger option when impact performance is the main priority, but it is not a hurricane rating and does not guarantee that hail will leave the roof undamaged.
What UL 2218 Measures — and What It Does Not
UL 2218 is a laboratory impact-resistance standard for prepared roof-covering materials. Steel balls of specified sizes are dropped onto a roof-covering test assembly, and the material is examined for cracking or other failure defined by the standard. Ratings run from Class 1 through Class 4.
Class 3 Test
A 1.75-inch steel ball is used at the Class 3 test level. This is a laboratory impact threshold, not a promise that every 1.75-inch hailstone will leave a roof undamaged.
Class 4 Test
A 2-inch steel ball is used at the Class 4 test level. Class 4 is the highest UL 2218 impact classification.
Separate Wind Tests
Wind performance is addressed through separate standards, including ASTM D3161 and ASTM D7158. An impact class should never be used as a substitute for the product’s wind documentation.
UL 2218 does not tell you how well the roof deck is attached, whether the deck seams are sealed, whether the flashing is correct, or whether wind-driven rain can enter through a vent. It also does not grade every type of cosmetic damage. UL Solutions and IBHS have specifically noted that traditional UL 2218 evaluation does not account for visible denting and granule loss in the same way that a more realistic hail-performance evaluation can.
Class 3 vs. Class 4 Shingles: Side-by-Side Comparison
| Comparison Point | Class 3 | Class 4 |
|---|---|---|
| UL 2218 impactor | 1.75-inch steel ball | 2-inch steel ball |
| Position in the rating system | One level below the highest class | Highest UL 2218 class |
| Best reason to compare it | Balanced cost and impact resistance | Maximum UL 2218 impact classification |
| Wind and water protection | Depends on separate product ratings and installation | Depends on separate product ratings and installation |
| Insurance treatment | Carrier- and product-specific | Carrier- and product-specific |
| Hail-damage guarantee | No | No |
The Important Limitation
A Class 4 label confirms a higher laboratory impact classification. It does not, by itself, prove better wind resistance, longer service life, better algae resistance, stronger seals, or less granule loss than every Class 3 product. Compare the exact product data sheet and the complete roofing scope.
Current Class 3 and Class 4 Shingle Examples
Product specifications change, so the exact line and current technical data matter more than the brand name alone. The following manufacturer-listed examples help Louisiana homeowners understand how common product families are currently positioned.
| Manufacturer and Product | Current Impact Class | What to Verify Before Ordering |
|---|---|---|
| Atlas Pinnacle Pristine | Class 3 | Exact color, package labeling, wind requirements, and current product documents |
| IKO Cambridge | Class 3 | Exact product documentation and installation requirements for the project location |
| IKO Dynasty | Class 3 | ArmourZone fastening requirements, accessories, and current technical data |
| Atlas Pinnacle Impact | Class 4 | Exact IR product name, package label, accessory system, and current technical data |
| IKO Nordic | Class 4 | Exact product, matching accessories, installation requirements, and current technical data |
Do not accept a proposal that lists only “Atlas shingles,” “IKO shingles,” or “impact-resistant architectural shingles.” The proposal and final invoice should identify the exact product line. Similar-looking shingles from the same manufacturer can carry different impact classifications.
Which Impact Class Makes Sense for a Louisiana Home?
Louisiana roofing decisions should not be reduced to a simple coastal-versus-inland rule. Homes across the state can experience hail, high winds, falling debris, prolonged heat, heavy rain, and wind-driven water. The right choice depends on the exact product, the roof assembly, the insurance policy, and the homeowner’s priorities.
Class 3 Can Be the Better Fit When
- The product provides the performance features you want at a more comfortable project price.
- Your insurer does not offer a meaningful difference for the Class 4 option.
- You would rather direct the available budget toward deck repairs, a sealed roof deck, edge details, flashing, or ventilation.
- The exact Class 3 line has the wind, algae-resistance, color, and system compatibility you need.
Class 4 Deserves a Close Look When
- You want the highest UL 2218 impact classification available in the selected shingle family.
- Your insurer confirms a financial benefit for the exact Class 4 product.
- Your roof has a history of hail or impact-related damage.
- The upgrade price makes sense within the full written scope, without cutting more important wind and water details.
The most useful comparison is not a Class 3 shingle on a strong roof versus a Class 4 shingle on a weak roof. Ask for two like-for-like proposals with the same tear-off scope, deck work, underlayment, edge metal, flashing, ventilation, accessories, cleanup, and documentation. Then compare only the product upgrade.
Impact-Rated Shingles Are Not the Same as a FORTIFIED Roof
A FORTIFIED Roof is a documented construction standard for the complete roof system. It addresses roof-deck attachment, a sealed roof deck, stronger roof edges, rated roof coverings, flashing, and wind- and rain-resistant details. An independent FORTIFIED Evaluator documents the work required for an official designation.
Deck Attachment
The roof deck must be attached according to the applicable FORTIFIED requirements.
Sealed Roof Deck
A secondary water barrier helps limit water entry if roof covering is damaged or removed.
Locked-Down Edges
Specific drip-edge and starter-strip details strengthen vulnerable eaves and rakes.
Documented Components
Shingles, vents, flashings, fasteners, and installation details must match the required scope.
For asphalt shingles, the standard FORTIFIED Roof path and the optional FORTIFIED Hail Supplement are also different. The optional Hail Supplement requires qualifying shingles rated Good or Excellent under the current IBHS Hail Impact-Resistant Shingle Ratings. A Class 4 label alone should not be assumed to satisfy that optional supplement.
Class 3, Class 4, Cost, and Louisiana Insurance
Do not buy an impact-rated shingle based on an estimated insurance discount. Carriers, policy forms, documentation requirements, and eligible product lists can differ. Ask your insurance agent to review the exact manufacturer and product line before the roofing contract is signed.
Questions to Send Your Insurance Agent
- Does my current policy recognize this exact Class 3 or Class 4 shingle?
- Is any credit based on the shingle alone, a wind-mitigation inspection, or an official FORTIFIED designation?
- Does the credit apply to the full premium or only a specific coverage component?
- Which documents are required: product data sheet, invoice, package label, photographs, inspection, or designation certificate?
- Will selecting this product affect my roof deductible, cosmetic-damage coverage, or future claim settlement?
Request the answer in writing when possible. If the insurer confirms annual savings, a simple planning calculation is:
Class 4 upgrade cost ÷ confirmed annual savings = estimated simple payback period
This calculation does not include changes to future premiums, deductibles, coverage, maintenance, or product availability. If the carrier offers no product-specific benefit, judge the upgrade primarily on the additional impact rating and your budget.
Class 3 and Class 4 Shingles on SHIC Roofing Projects
Completed projects are useful because they show the exact shingle line as part of an installed Louisiana roof, not just a sample board or manufacturer brochure.
Atlas Pinnacle Pristine in Slidell
See a completed Slidell roof using Atlas Pinnacle Pristine HP42 shingles in Summer Storm.
View Project → Class 3 ProjectIKO Dynasty in Abita Springs
Review a FORTIFIED roof project with IKO Dynasty Class 3 shingles in Summit Grey.
View Project → Class 4 ProjectAtlas Pinnacle Impact in Mandeville
See a Louisiana FORTIFIED roof project using Class 4 Atlas Pinnacle Impact shingles.
View Project →What a Complete Roofing Quote Should Identify
A clear quote makes Class 3 and Class 4 options easy to compare. Ask for the following details in writing rather than relying on a verbal product description.
Official Resources for Verification
UL 2218 and IBHS Testing
Review how traditional impact classification and realistic hail-performance evaluation differ.
Visit UL Solutions → IBHS FORTIFIEDFORTIFIED Roof Requirements
Check the current roof-system and optional hail-protection requirements.
Visit FORTIFIED → Louisiana Department of InsuranceLouisiana Fortify Homes Program
Confirm current program information, eligibility, funding status, and homeowner requirements.
Visit LDI →Frequently Asked Questions
What is the main difference between Class 3 and Class 4 shingles?
Both are impact classifications under UL 2218. Class 3 uses a 1.75-inch steel-ball test level, while Class 4 uses a 2-inch steel-ball test level and is the highest class in the standard.
Are Class 4 shingles hurricane-proof?
No. Class 4 is an impact rating, not a hurricane or wind rating. Hurricane resilience depends on the entire roof system, including the deck attachment, sealed deck, edges, fastening, flashing, vents, and installation quality.
Can Class 3 shingles be used on a FORTIFIED Roof?
A Class 3 product may be used when it meets the applicable FORTIFIED roof-covering and wind requirements for the project. The optional FORTIFIED Hail Supplement has additional shingle requirements based on the current IBHS Hail Impact-Resistant Shingle Ratings. Confirm the planned product with the evaluator before ordering.
Do Class 4 shingles prevent all hail damage?
No. Class 4 confirms performance in a defined laboratory test. Actual hail varies in size, hardness, shape, wind speed, angle, and number of impacts. Cosmetic or functional damage can still occur.
Does Class 4 automatically mean better granule retention?
No. UL 2218 classification alone does not provide a complete comparison of denting or granule loss. Review the current IBHS Hail Impact-Resistant Shingle Ratings when real-world hail performance is a major concern.
Will an impact-rated shingle lower my Louisiana insurance premium?
Possibly, but eligibility is carrier-, policy-, and product-specific. Ask the agent to review the exact shingle line and explain which documents or inspections are required before you choose the upgrade.
How much more do Class 4 shingles cost?
The difference changes by product line, distributor availability, roof size, accessories, and installation scope. Ask for two otherwise identical written proposals so the Class 4 upgrade is shown as a separate line item.
Compare Class 3 and Class 4 Roof Options
Southern Home Improvement Center can inspect your roof, review the complete system, and provide a written comparison using exact shingle products. You will see what changes between the options before deciding.
Request a Free Roofing Estimate