Class 4 Shingles vs. a FORTIFIED Roof: What Oklahoma Homeowners Should Know Before Replacing Their Roof
When it’s time to replace your roof in Oklahoma, choosing a shingle color is only one part of the decision. You also have an opportunity to consider how your next roof will handle severe weather.
Two terms you may encounter are Class 4 impact-resistant shingles and FORTIFIED Roof™. Both relate to roof performance, but they describe different things.
Class 4 refers to a roof covering’s impact-resistance classification. FORTIFIED addresses the roofing system, its installation, and verification that applicable requirements have been met. Understanding that difference can help you ask better questions and compare replacement proposals.
What Are Class 4 Impact-Resistant Shingles?
When a shingle carries a UL 2218 Class 4 rating, it has passed a controlled laboratory impact test. The test involves dropping a two-inch steel ball from a height of 20 feet onto specified locations on a roofing test assembly.
Class 4 is the highest classification under UL 2218. It provides useful information about how a product performed under those test conditions.
However, a laboratory rating does not make a shingle hail-proof. UL notes that steel-ball test results do not have an established direct correlation with performance under actual hail impacts.
For homeowners, the practical takeaway is straightforward: use the rating as one part of your decision. Ask about the specific product, its installation requirements, and the protection offered by the rest of the roof.
What Is a FORTIFIED Roof?
FORTIFIED Roof is a voluntary construction and reroofing standard developed by the Insurance Institute for Business & Home Safety, or IBHS.
It addresses several vulnerable parts of a roofing system, including:
Roof deck attachment: Fastening requirements help improve resistance to wind uplift.
Sealed roof deck: Approved methods help limit water entry through deck seams if the roof covering is lost.
Roof edges: Specific materials and installation details strengthen vulnerable perimeter areas.
Roof coverings: Products must satisfy applicable performance requirements.
These measures work together to improve storm resistance.
Class 4 Shingles vs. FORTIFIED: A Side-by-Side Comparison
| Question | Class 4 shingles | FORTIFIED Roof |
|---|---|---|
| What does it describe? | A roof covering’s impact-resistance classification | A roofing system meeting a construction and verification standard |
| Does it establish how the decking is attached? | No | Includes applicable deck attachment requirements |
| Does it require a sealed roof deck? | The shingle rating alone does not | Yes |
| Does it address roof-edge construction? | The shingle rating alone does not | Yes |
| Does it establish an official FORTIFIED designation? | No | Requires documentation and program review |
A replacement estimate should make clear which of these features are included. The words “impact-resistant shingles” alone do not tell you how the roof beneath them will be built.
Can a FORTIFIED Roof Include Class 4 Shingles?
Yes, provided the selected shingles meet the requirements applicable to the project. The two options can overlap.
There is also an important distinction for homeowners concerned about hail: FORTIFIED offers an optional Hail Supplement. For asphalt shingles, this requires a “Good” or “Excellent” rating on the applicable IBHS Hail Impact-Resistant Shingle Ratings. A Class 4 label alone does not establish eligibility.
Before approving materials, ask your contractor to identify the exact shingle product and explain which requirements it meets.
Why Independent Verification Matters
Many important roofing details become difficult to inspect once the shingles are installed. Deck fastening and sealed-deck work are examples.
For an official FORTIFIED designation, a certified independent evaluator documents required construction details and submits information for review. IBHS determines whether the property qualifies.
Mallard’s FORTIFIED Roof information page explains this process and how its team prepares for these projects.
If you are considering FORTIFIED, discuss evaluation and documentation before construction begins. Ask who will coordinate the evaluator and what is included in the proposal.
How Should You Compare the Cost?
Ask for written estimates that identify the materials, construction details, and evaluation services included in each option.
A useful comparison might include:
A replacement using the proposed standard shingle.
A replacement using a specified impact-resistant shingle.
A replacement designed to pursue a FORTIFIED designation, with the optional Hail Supplement identified separately if proposed.
Ask your contractor to explain the price differences line by line. Which costs come from the shingles? Which come from decking work, installation details, or evaluation?
This gives you a more useful comparison than looking only at the total price or shingle brand.
Will Either Option Lower Your Insurance Premium?
Some insurers may offer discounts for qualifying impact-resistant shingles or FORTIFIED-designated properties. Availability and amounts vary, and savings are not guaranteed. Confirm eligibility directly with your insurance agent before choosing an upgrade based on an expected discount.
Ask your agent:
Does my policy offer an incentive for the exact shingle being proposed?
Is there a separate incentive for an official FORTIFIED designation?
What documentation would I need to provide?
Would choosing either option change any policy terms?
Get those answers before construction so you can make a decision using your actual policy.
Questions to Ask Before Signing a Roofing Proposal
Whether you live in Oklahoma City, Moore, Norman, Edmond, or a surrounding community, bring these questions to your roofing consultation:
What exact shingle manufacturer and product are included?
What impact and wind ratings does that product carry?
How will the existing decking be inspected?
How will any necessary decking repairs be priced?
What roof-deck sealing method is included?
What work is included at roof edges, flashing, and vents?
Does the proposal include pursuing an official FORTIFIED designation?
Is the optional Hail Supplement included?
Who handles evaluation and construction documentation?
What do the product and workmanship warranties cover?
Clear answers help you understand what you are purchasing and make competing estimates easier to evaluate.
Explore Your Roof Replacement Options With Mallard
A roof replacement is a chance to make informed choices about the materials and construction protecting your home.
Mallard Construction & Roofing has completed specialized FORTIFIED Roof training and passed the roofing contractor certification exam. Our team can discuss your existing roof, explain replacement options, and help you understand whether pursuing FORTIFIED makes sense for your property.
Planning a roof replacement in the Oklahoma City area? Call (405) 364-4501 or schedule a free roof inspection. Ask us about impact-resistant shingles, FORTIFIED Roof requirements, and the differences between your options.
