The two types of roof warranty
Almost every roof warranty falls into one of two buckets, and they protect you against very different things.
- Manufacturer (material) warranty. Comes from the shingle manufacturer and covers defects in the materials themselves — the shingles, underlayment, and system components.
- Workmanship (labor) warranty. Comes from the contractor who installed the roof and covers mistakes in the installation. Most roof failures are installation-related, not material defects — which is why this coverage matters so much.
Here is the catch most homeowners never hear: the strongest manufacturer warranties are only available through a manufacturer's top-tier certified installers. A roofer who is not certified cannot register them, no matter how good the shingles are.
Why our certifications unlock better warranties
DeHart Roofing holds all four of the top manufacturer certifications — the only contractor in Stanislaus County to do so. Each one unlocks that brand's strongest warranty:
- Owens Corning Platinum Preferred → Platinum Protection Limited Warranty. Up to 50 years on materials, up to 25 years of labor backed by Owens Corning, and no proration in the first 10 years. DeHart is the only OC Platinum Preferred contractor in Stanislaus County.
- GAF Master Elite & GAF Gold Elite → Golden Pledge Limited Warranty. Up to 50 years on materials and up to 25 years of workmanship coverage backed by GAF, plus a post-installation inspection.
- CertainTeed Select ShingleMaster → SureStart PLUS coverage on a CertainTeed integrity roof system.
See the full breakdown on our certifications page or our in-depth roofing warranty guide.
What can void your roof warranty
A warranty is only as good as the install behind it. These are the most common ways a roof warranty gets voided — and how we prevent each one:
- An uncertified installer. We carry all four top certifications, so the manufacturer honors the coverage.
- Poor attic ventilation. We check and correct ventilation as part of every replacement.
- Layering over an old roof. We tear off to the deck and inspect it before new material goes on.
- Unpermitted work. We pull the proper permit and manage inspections for you.
- Skipped registration. We register your warranty and hand you the documentation.