A roofing warranty is your safety net—covering material defects or installation issues—but only as long as you follow its rules. Whether you’re in Chesterfield, MO, Belleville, IL, or anywhere else, knowing what can void your warranty is essential to protect your investment.
If you’re unfamiliar with how warranties work or why they matter, you might want to start with our guide on Why You Need a Roofing Warranty: The Risks of Going Without.
Types of Roofing Warranties
Before diving into voids, it’s important to understand the two main warranty types:
- Manufacturer’s Warranty: Covers defects in roofing materials (shingles, underlayment, flashing).
- Workmanship Warranty: Covers installation errors and is issued by your contractor.
Each comes with its own rules—most often, following manufacturer specifications and using certified contractors.
👉 If you have a CertainTeed roof, you can learn more about its coverage in our article What is the CertainTeed Shinglemaster Warranty? Important Facts to Know.
Common Actions That Void Roofing Warranties
Here are the most frequent missteps that void warranties—and how to avoid them:
Improper Installation
Not following the manufacturer’s installation instructions strictly—including fastener type, placement, and underlayment—can nullify your warranty. Always hire trained, certified installers.
If your project involves a specialized system like Geneflex, improper installation can instantly cancel coverage. Read our What is the Geneflex Warranty? The Perfect Fit for Commercial Roofs for details.
Layering a New Roof Over Old Shingles
Installing new shingles over an existing layer prevents proper inspection and adhesion, increasing the failure risk. Nearly all manufacturers void warranties for this shortcut.
Modified or Cut Roofing Materials
Cutting, altering, or using unapproved accessories (e.g., flashings, underlayment, vents) disrupts the roof system and voids coverage.
Unauthorized Attachments—such as Solar Panels or Satellite Dishes
Installing rooftop devices without approved methods introduces risks like drilling leaks or improper sealing, often voiding both material and workmanship warranties.
Poor Roof Ventilation
Inadequate airflow causes heat and moisture buildup, leading to shingle damage, deck rot, or mold, which most warranties won’t cover.
Pressure Washing or Abrasive Cleaning
High-pressure cleaning removes protective granules from shingles, compromising weather resistance and voiding manufacturer guarantees.
Using Non-Approved Materials for Repairs
Substituting any component with unauthorized products—like different-brand flashing—can invalidate the coverage.
DIY Work or Repairs by Unlicensed Contractors
Unauthorised repairs, even if well-intended, can void warranties. Stick to certified professionals for any roof work.
Failing to Register or Transfer the Warranty
Many warranties require prompt registration and documentation to remain valid. Some even lapse if the property changes hands without a transfer.
Why These Rules Matter for Missouri & Illinois Homeowners
In areas like O’Fallon, MO, or Swansea, IL, adhering to warranty terms also protects you from local weather and building codes:
- Layered roofs are especially vulnerable in Illinois winters, where ice dams can exacerbate hidden damage.
- Ventilation issues are common in humid Missouri summers—unchecked issues might void warranties when they’re needed most.
- Registering warranties avoids complications if you ever sell your home in communities like Chesterfield or Belleville.
👉 For a deeper look at how warranties can affect your financial protection after a storm, see How Roofing Warranties Impact Insurance Claims – What You Need to Know.
Void vs. Safe Practices
How to Keep Your Warranty Valid
- Always register your warranty immediately after installation.
- Hire certified roofing contractors who know the fine print and follow manufacturer specs.
- Schedule regular roof and attic inspections, especially after storms or seasonal shifts.
- Use approved products and methods for any repairs or upgrades.
- Document everything—keep invoices, inspection reports, and warranty paperwork safe.
👉 For more on how choosing the right coverage can save money over time, check out Why the Right Warranty Matters for Long-Term Savings? Facts You Need To Know.
Keep Your Roof and Warranty Secure
Your roofing warranty is only as good as the steps you take to preserve it. Avoid shortcuts like layering shingles or DIY repairs, and choose certified professionals who follow every detail of manufacturer requirements.
Your roof is built to protect—you deserve a warranty that does the same.
Need Warranty Protection You Can Count On?
At Gorilla Roofing, we pride ourselves on delivering top-notch roofing services with integrity and professionalism. Our team is licensed, insured, and committed to exceeding your expectations.
📞 Call us today at (636) 295-1212
🌐 Request a FREE roofing estimate
Contact Gorilla Roofing today for expert installation and peace of mind—worry-free warranty protection.