By Camen James, Owner · Owens Corning Platinum Preferred Contractor · Updated June 2026 · 6 min read
Short Answer
Owens Corning Preferred means the contractor is certified, trained, and authorized to register the Owens Corning System Protection Limited Warranty on your roof. Platinum Preferred is the top 1% of OC contractors nationwide and unlocks the strongest tier of the Total Protection Roofing System warranty, with extended labor coverage and full transferability. Both are real warranties backed by Owens Corning. The tier just changes the strength of the coverage.
If you're hiring a roofer in Northeast Ohio, you've probably seen Owens Corning badges everywhere — on trucks, yard signs, and contractor websites. The badges aren't interchangeable. Owens Corning's contractor network has three tiers: Certified, Preferred, and Platinum Preferred. Each unlocks a different warranty.
Here's what each tier actually means, what it gets you, and how to verify any contractor's status in 30 seconds before you sign anything.
What Is Owens Corning Preferred?
Owens Corning Preferred Contractor is the standard verified tier of OC's contractor network. To earn and keep the badge, a roofer must:
- Carry workers' compensation and general liability insurance at OC's minimum thresholds
- Complete documented installer training across the crew, not just the owner
- Maintain multi-year program tenure with OC
- Pass consistent customer satisfaction reviews
- Install to Owens Corning's published specifications so the warranty registers correctly
What Preferred gets you: the Owens Corning System Protection Limited Warranty. Your shingles are covered for the lifetime of the original homeowner against manufacturing defects, paired with limited coverage on other OC-branded system components (underlayment, starter, hip-and-ridge) when they're installed together.
For most Northeast Ohio homeowners, this is excellent coverage — and it pairs well with smaller, owner-involved operations where the owner is on every adjuster meeting and walks every job.
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What Is Platinum Preferred?
Platinum Preferred is the top of Owens Corning's pyramid. Less than 1% of roofing contractors nationwide hold this certification. Platinum requires everything Preferred does, plus:
- Sustained Preferred status for multiple consecutive years
- Elite customer satisfaction scores year over year (audited by OC)
- Sustained volume thresholds — Platinum is quality at scale
- Continuous training across the entire crew, not a one-time certification
- Audited business practices and verified financial stability
What Platinum gets you: the Owens Corning Total Protection Roofing System warranty at its strongest tier. That means coverage on shingles, underlayment, starter, hip-and-ridge, and ventilation as one integrated system. It also extends labor coverage on warranty repairs and offers stronger transferability if you sell the home.
Platinum is the gold standard for warranty strength. It's especially valuable if you're planning to stay in the home long-term or expect to sell within the warranty window — a transferable Platinum warranty is a real selling point.
Why This Matters for Your Roof Warranty
Every Owens Corning shingle carries a basic material warranty from the factory — defects in the shingle itself. That's automatic. What changes between tiers is the system warranty: how much of the rest of the roof is covered, for how long, and whether labor is included when a warranty claim is filed.
The three things that actually change between tiers
- Component coverage — Platinum extends warranty to underlayment, starter, ridge cap, and hip-and-ridge products when installed together. Preferred has narrower component coverage.
- Labor coverage — Platinum covers the labor cost to install replacement shingles under warranty for an extended period. Preferred has a shorter labor-coverage window.
- Transferability — Platinum has full transferability to a new homeowner. Preferred is limited (typically one transfer, reduced remaining coverage).
For comparison shopping across brands, see our guide on GAF vs Owens Corning vs IKO shingles in Ohio. The brand you choose matters — but the contractor tier matters just as much, because the contractor is the one who registers and stands behind the warranty for the life of your roof.
For the full breakdown of what's covered, who pays for what, and what voids your coverage, read our complete warranty guide.
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Cornerstone's Certification Status
Cornerstone Roofing and Siding is an Owens Corning Platinum Preferred Contractor, the top tier of OC's contractor network. Every roof we install is registered with Owens Corning so your warranty activates automatically. You don't have to chase it down.
Platinum Preferred is held by less than 1% of roofing contractors nationwide. Owens Corning awards it based on sustained volume, customer satisfaction, continuous crew training, and audited business practices. For you, it means access to Owens Corning's strongest warranty coverage and the assurance that the manufacturer itself has vetted how we install.
You can verify our current status directly on Owens Corning's contractor directory — search Wooster, Ohio, and we'll appear with our current tier badge.
What you get when you install with us
- Eligibility for Owens Corning's top-tier Platinum Protection warranty, registered automatically
- 10-year Cornerstone workmanship warranty on the install itself
- Owner-walked installations — Camen is on every project personally
- Headquartered in Wooster, Ohio — we're here next year and the year after
Whatever roofer you hire, ask them three questions before you sign: What's your current Owens Corning tier? Can you show me your listing in the OC directory right now? Which OC warranty version applies to my install — in writing? If they can't answer all three confidently, keep shopping.
Frequently Asked Questions
What's the difference between Owens Corning Preferred and Platinum Preferred?
Preferred Contractor is the standard verified tier: a roofer with documented installer training, workers' comp, and Owens Corning's workmanship requirements. Platinum Preferred is the top 1% of OC contractors nationwide, earned through sustained volume, quality metrics, customer satisfaction scores, and continuous training. Platinum Preferred unlocks the strongest tier of the Owens Corning Total Protection Roofing System warranty, the Platinum Protection Limited Warranty.
How do I verify a contractor's actual Owens Corning tier?
Go to owenscorning.com/en-us/roofing/contractors and search by ZIP code. Your contractor will appear with their current tier badge. If they don't appear in the OC directory at all, they may carry no OC certification — they're simply installing OC shingles without the manufacturer-backed installation warranty.
Does Cornerstone Roofing and Siding have Platinum Preferred status?
Yes. Cornerstone Roofing and Siding is an Owens Corning Platinum Preferred Contractor, the top tier of OC's contractor network. Platinum Preferred is held by less than 1% of roofing contractors nationwide and is awarded based on sustained volume, customer satisfaction, continuous crew training, and audited business practices. It authorizes us to register Owens Corning's strongest system warranties, including the top-tier Platinum Protection Roofing System Limited Warranty.
Which Owens Corning warranty applies to my new roof?
It depends on your contractor's tier. The Owens Corning installation warranty requires installation by a Certified, Preferred, or Platinum Preferred contractor. Preferred unlocks the Owens Corning System Protection Limited Warranty on the shingle system. Platinum unlocks the strongest tier of the Total Protection Roofing System warranty with extended labor and component coverage.
Should I only hire a Platinum Preferred contractor?
Not necessarily. Platinum is excellent if you want maximum warranty transferability or extended labor coverage on warranty repairs. Preferred is excellent coverage for most Northeast Ohio homeowners and often pairs with smaller, owner-involved operations where the owner walks every adjuster meeting personally. The right answer depends on how long you'll own the home and how involved you want your contractor to be.
How does the Owens Corning warranty compare to GAF or IKO?
Owens Corning, GAF, and IKO all offer lifetime limited warranties on their shingles, but the system warranties differ. Owens Corning's Total Protection System (Platinum tier) covers shingles plus underlayment, starter, hip-and-ridge, and ventilation as a single integrated system. The exact coverage depends on which components you install together — your contractor should put the specific warranty version in writing before you sign.
How do I verify Cornerstone's Owens Corning Platinum Preferred status?
Search owenscorning.com/en-us/roofing/contractors by Wooster, Ohio, and Cornerstone Roofing and Siding appears with our current Platinum Preferred tier badge. Owner Camen James personally walks the certification requirements with every install crew, and every Cornerstone roof is installed to Owens Corning's published specifications so the warranty registers correctly.
Questions about which warranty applies to your roof?
Call us for a free inspection. We'll explain exactly which Owens Corning warranty tier applies to your install — in writing, before you sign anything.
Related reading: GAF vs Owens Corning vs IKO shingles in Ohio · Cornerstone Warranty Guide
Our services: Owens Corning Roofing · Roof Replacement · Wooster Roofing Services
