Class 3 vs. Class 4 Shingles: Comparing GAF and Owens Corning for Your Clear Lake Roof
Updated: Oct 14
Choosing between Class 3 and Class 4 shingles is easier when your estimate names the exact product and explains what changes with the upgrade. For homeowners in Clear Lake, Webster, Friendswood and League City, this is a useful conversation to have before signing a roof replacement proposal. Start with the roof’s condition, then compare materials, the complete installation scope and your budget.
What is the difference between Class 3 and Class 4?
Both are impact classifications from controlled testing. Under UL 2218, Class 3 uses a 1.75-inch steel ball dropped from 17 feet; Class 4 uses a 2-inch ball dropped from 20 feet and is the highest class in that test. Neither classification makes a roof hail-proof. Wind performance, water protection and warranty coverage are separate questions.
Ask where the proposed shingle’s rating is documented. Check the current manufacturer data sheet and the packaging delivered to your home. Keep that information with your final invoice and roof records instead of relying on a general description such as “premium architectural shingles.”
Which GAF and Owens Corning products should you compare?
GAF’s current Timberline HDZ specification lists a UL 2218 Class 3 rating for qualifying labeled packages. Owens Corning’s impact-resistance data sheet lists TruDefinition Duration and several other Duration Series products as Class 3. These are product-specific statements; they do not mean every shingle from either manufacturer has the same rating.
For a Class 4 comparison, ask about suitable GAF Timberline AS II or Timberline UHDZ with UltraMat options and Owens Corning Duration FLEX or Duration STORM. Confirm local availability and the exact current product specification. If your proposal describes an impact-resistant roof system, also ask which hip and ridge components are required.
How should you compare the two estimates?
Request two written options for the same roof. Keep the tear-off, underlayment, flashing, ventilation, decking allowance, cleanup and workmanship scope comparable. Ask which material and accessory changes account for the price difference. An upgrade price is much more useful when you can see exactly what is included.
Discuss the roof’s exposure, your plans for the property and any existing leak concerns. A Class 4 upgrade does not diagnose a leak or correct an incomplete flashing detail. Ask your contractor to explain the condition findings and the proposed installation before focusing on the shingle label.
Questions to discuss during your roofing or exterior evaluation.
Questions for your insurer and contractor
Before relying on an insurance discount, ask your insurer whether the exact product qualifies, which documents it needs and how any endorsement affects your coverage. Eligibility and savings vary. Ask the contractor for the actual manufacturer warranty name, installation requirements and registration responsibilities in writing.
Three useful questions for your assessment are: What exact Class 3 and Class 4 products are available for my roof? What changes in the complete scope and total price? What product and warranty documents will I receive when the project is finished?
Compare options for your Clear Lake roof
RANLOCK is a GAF Certified contractor and an Owens Corning Roofing Preferred Contractor. Tell us your city, ZIP, approximate roof age and whether you have a leak or storm concern. We can assess the roof and help you compare appropriate repair or replacement options.
Compare suitable roof systems with our roof replacement services, then request a roof assessment to discuss your property.
RANLOCK Roofing & Construction LLC • 1322 Space Park Dr, Suite C113, Houston, TX 77058 • support@ranlock.com