Roof Warranty Guide: What's Actually Covered (and What's Not)

The Two Types of Roof Warranties

Every new roof should come with two separate warranties, each covering different types of failures:

• MANUFACTURER WARRANTY — Covers defects in the roofing materials themselves. If shingles crack, curl, lose granules prematurely, or develop algae staining within the warranty period, the manufacturer covers replacement materials. This is provided by the shingle manufacturer (GAF, Owens Corning, CertainTeed, etc.) and typically lasts 25–50 years for architectural shingles.
• WORKMANSHIP WARRANTY — Covers installation errors. If a leak develops because flashing was installed wrong, shingles were nailed improperly, or ventilation was inadequate, the workmanship warranty covers the repair. This is provided by your roofing contractor and typically lasts 5–15 years, though some certified installers offer 25-year or even lifetime workmanship coverage.
• YOU NEED BOTH. A manufacturer warranty without a workmanship warranty leaves you exposed to the most common source of roof failure: installation errors. A workmanship warranty without a manufacturer warranty means you are paying out of pocket if materials are defective.

What VOIDS Your Roof Warranty

This is where most homeowners get burned. Even a top-tier warranty can be voided by actions that seem harmless:

• IMPROPER VENTILATION — This is the #1 warranty killer. If your attic doesn't have adequate intake and exhaust ventilation per manufacturer specs, the warranty is void. Poor ventilation causes premature shingle deterioration, and manufacturers will deny claims if ventilation is insufficient.
• PRESSURE WASHING — Never pressure wash a shingle roof. It blasts away the protective granules and voids the warranty immediately. If you have algae or moss, use a gentle bleach solution or hire a soft-wash specialist.
• UNAUTHORIZED MODIFICATIONS — Mounting a satellite dish, solar panels, or any penetration through the roof without following the manufacturer's approved method can void the warranty. Always check with your roofer before adding anything to the roof.
• WALKING ON THE ROOF — Repeated foot traffic damages shingles, especially in hot weather when they are soft. Limit roof access and use proper walkways if access is needed.
• LAYERING (OVERLAY) — If new shingles were installed over old ones instead of a full tear-off, most manufacturer warranties are significantly reduced or voided entirely.
• NON-MANUFACTURER ACCESSORIES — Using a different brand of ridge cap, starter strip, or underlayment than the shingle manufacturer specifies can void the system warranty.
• FAILURE TO REGISTER — Some warranties must be registered within 30–60 days of installation. If your contractor doesn't register, you may default to the shorter standard warranty.

How to File a Warranty Claim

If you believe your roof has a defect covered by warranty, here is the correct process:

• For WORKMANSHIP issues (leaks, flashing problems, installation defects): Contact your contractor directly. They are responsible for repairs under their workmanship warranty. Document the issue with photos and written communication.
• For MATERIAL defects (premature cracking, curling, granule loss): Contact the manufacturer's warranty department. They will send an inspector to evaluate the claim. You will need your warranty registration number and proof of installation.
• Keep your installation contract, warranty documentation, and any registration confirmations in a safe place. You will need these for any claim.
• Take photos of the problem from the ground and from the attic (if you can see daylight or water stains). Time-stamped photos are your best evidence.
• If your contractor has gone out of business, your workmanship warranty is effectively worthless — another reason to choose established contractors. Your manufacturer warranty still applies regardless.

Frequently Asked Questions