Two Warranties, Two Very Different Things
When you get a new roof, you actually receive two separate warranties. The first is the manufacturer warranty. It covers the shingles and roofing materials themselves. The second is the workmanship warranty. It covers the installation. They protect against completely different types of failure, they come from different sources, and they have different terms.
Most homeowners assume "my roof has a 30-year warranty" and leave it at that. But a 30-year shingle warranty means nothing if the contractor who installed it used the wrong nailing pattern, skipped the ice and water shield, or didn't ventilate the attic properly. Those are installation failures, and the manufacturer won't cover them.
Understanding the difference between these two warranties, and knowing what voids each one. Can save you thousands of dollars and a lot of frustration when something goes wrong. If you're dealing with hail damage or need to file a roof insurance claim, understanding your warranty coverage is especially critical. For help picking the right shingles, see our roofing shingles guide, and our guide on choosing a roofing contractor covers what to look for in workmanship quality.
Manufacturer Warranty: What It Actually Covers
The manufacturer warranty covers defects in the roofing material itself. If a shingle cracks, delaminates, or loses granules due to a manufacturing flaw, not weather, not age, not installation error. The manufacturer will replace the defective material.
Here's what most homeowners don't realize: the manufacturer warranty does not cover most of the things that actually go wrong with a roof. It does not cover installation errors, storm damage, normal wear and tear, or damage caused by improper attic ventilation. Those are the four most common causes of roof failure, and none of them are the manufacturer's problem.
Standard Manufacturer Warranty Coverage
Covered
- Manufacturing defects in the shingle
- Premature granule loss from production flaws
- Delamination or splitting from material failure
- Algae staining (on algae-resistant lines)
Not Covered
- Installation errors (nailing, flashing, sealing)
- Storm damage (hail, wind, fallen trees)
- Normal wear and aging
- Damage from poor ventilation
Standard manufacturer warranties range from 25 to 50 years depending on the shingle line. Premium shingles like Owens Corning Duration or GAF Timberline HDZ carry longer warranty periods. But remember. The warranty length only matters for manufacturing defects, which are the least common type of roof failure.
Enhanced system warranties change this equation significantly. When a manufacturer-certified contractor installs a complete system from one manufacturer, the warranty can be upgraded to cover both materials and workmanship under one umbrella. Backed by the manufacturer. More on this in a moment.
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Workmanship Warranty: The One That Matters Most
The workmanship warranty covers the quality of the installation. Improper nailing, bad flashing details, incorrect underlayment application, inadequate ventilation, misaligned starter strips. Anything that goes wrong because of how the roof was installed, not what it was made of.
This is where roughly 80% of roof failures occur. The shingle itself is almost never the problem. The problem is in the installation. A nail driven through the wrong zone, flashing that wasn't stepped properly into the wall, ice and water shield that was skipped in the valleys, or ridge vent that doesn't provide adequate exhaust.
The warranty gap most homeowners fall into: Many contractors offer only a 1-2 year workmanship warranty. That sounds reasonable. Until you realize that installation defects often don't show symptoms for 3-5 years. A nail pop might not cause a visible leak until the third winter. Flashing that was sealed with caulk instead of properly stepped will hold for 2-3 years before the caulk fails. By the time the problem appears, the workmanship warranty has expired.
We offer a 10-year workmanship warranty because we know our installations hold up. If something fails because of how we installed it, we fix it, no questions, no cost to you, for a full decade.
Be cautious of "lifetime" workmanship warranties from contractors who have only been in business for a few years. A warranty is only as strong as the company backing it. If the contractor closes shop in year five, your "lifetime" warranty closes with them. Look at the company's track record. How long have they been operating? Do they have a physical location? Are they insured? Do they have a consistent review history going back years, not months?
A 10-year warranty from a contractor with 152 Google reviews and a proven track record is worth more than a lifetime warranty from a company you can't verify will exist next year.
What Voids Your Warranty
These five actions are the most common reasons manufacturer warranties get denied. Every one of them is avoidable. If you know about them before they happen.
Poor Ventilation
Owens Corning, GAF, and CertainTeed all require adequate attic ventilation as a condition of their warranties. The standard requirement is 1 square foot of net free ventilation area for every 150 square feet of attic floor space (or 1:300 with a vapor barrier). Insufficient ventilation traps heat and moisture in the attic, which bakes shingles from below and causes premature curling, cracking, and granule loss. When a manufacturer inspects a warranty claim and finds inadequate ventilation, they deny it. Even if the shingles are clearly defective.
Unauthorized Modifications
Drilling holes in your roof for a satellite dish, adding a skylight, or attaching solar panel mounts without following the manufacturer's guidelines can void your warranty. Every penetration point is a potential leak source, and manufacturers don't want to be responsible for damage caused by unauthorized modifications. If you need to modify your roof, check your warranty terms first and hire a qualified contractor who follows manufacturer installation specs for penetrations.
Power Washing Shingles
It looks great for about a week, and then your roof starts failing. Power washing strips the protective granule layer off asphalt shingles. The same granules that block UV radiation and prevent premature aging. Once those granules are gone, the asphalt underneath degrades rapidly. Every major manufacturer explicitly lists power washing as a warranty-voiding action. If you have algae stains, use a manufacturer-approved low-pressure chemical treatment instead.
Walking on the Roof Frequently
Every time someone walks on an asphalt shingle roof, they risk breaking seal strips (the adhesive that bonds each shingle to the one below), cracking shingles in cold weather, and grinding granules loose underfoot. Occasional access for inspections or repairs is expected, but regular foot traffic. Maintenance workers crossing the roof to access HVAC units, for example. Causes cumulative damage that voids the warranty. If your roof has equipment that requires regular access, install walk pads to distribute weight and protect the membrane.
Mixing Manufacturer Products
Using one brand's shingles with another brand's underlayment, starter strips, or ridge cap voids most system warranties. Manufacturers design their products to work together. The adhesive on starter strips is formulated to bond with the same brand's shingle, the underlayment is tested with the same brand's fastener schedule, and the ridge cap is designed to match the profile of the same brand's field shingles. When you mix brands, no manufacturer will take responsibility for the system as a whole.
Why OC Platinum Preferred Contractor Status Matters
Owens Corning doesn't certify every contractor who buys their shingles. The Platinum Preferred Contractor program requires meeting specific standards for training, insurance coverage, business practices, and installation quality. Only a fraction of roofing contractors in any market qualify.
Why does this matter for your warranty? Because Platinum Preferred Contractors can offer enhanced system warranties that solve the biggest problem in roofing warranties: the gap between material coverage and workmanship coverage.
Standard vs. Enhanced Warranty Comparison
Standard (Any Contractor)
- Material warranty from manufacturer
- Separate workmanship warranty from contractor
- Two different entities to deal with
- Workmanship coverage ends when contractor closes
- Must prove which failure type to file claim
Enhanced (OC Platinum Preferred)
- Materials AND workmanship under one warranty
- Backed by Owens Corning directly
- Coverage continues if contractor closes
- Single point of contact for any issue
- Transferable to new homeowner
The enhanced warranty eliminates the finger-pointing that plagues standard warranty claims. With a standard setup, the manufacturer says "that's an installation problem. Call your contractor," and the contractor says "that's a material defect. Call the manufacturer." With an enhanced system warranty through an OC Platinum Preferred Contractor, Owens Corning owns the entire warranty. One call, one claim, one resolution.
Perhaps most importantly: if something goes wrong and the original contractor is no longer in business, Owens Corning still honors the enhanced warranty. With a standard workmanship warranty, if the contractor closes shop, your workmanship coverage disappears with them. The enhanced warranty removes that risk entirely.
Questions to Ask About Warranty Before You Hire
Before signing a contract with any roofing contractor, ask these six questions. The answers will tell you more about the quality of the contractor than any sales pitch.
"What is your workmanship warranty length?"
Industry standard is 1-2 years. Better contractors offer 5-10 years. Be wary of 'lifetime' claims from new companies. A lifetime warranty means nothing if the company closes in 5 years. Look for established contractors with a track record that matches their warranty length.
"Is the warranty in writing?"
A verbal warranty is worthless. Get the full warranty terms in writing before work begins. Including what's covered, what's excluded, the length, and the process for filing a claim. If a contractor won't put their warranty in writing, that tells you everything you need to know.
"What exactly is covered and what's excluded?"
Some workmanship warranties only cover leaks. Better warranties cover all installation-related issues. Nail pops, flashing failures, ventilation problems, ice dam damage caused by improper installation. Know the exclusions upfront so you're not surprised when you need to use it.
"Are you a manufacturer-certified installer?"
Certified installers (like Owens Corning Platinum Preferred Contractors or GAF Master Elite) can offer enhanced system warranties that cover both materials and labor under one warranty backed by the manufacturer. Non-certified installers can only offer the standard material warranty plus their own separate workmanship warranty.
"Will my warranty transfer if I sell my home?"
A transferable warranty adds real value to your home. It's a selling point that competitive buyers notice. Most manufacturer warranties transfer with registration. Workmanship warranties may or may not transfer depending on the contractor. Get transfer terms in writing before installation.
"What actions on my part would void the warranty?"
Every warranty has conditions. Knowing them upfront prevents accidental voiding. Common conditions include maintaining proper ventilation, not pressure washing, using approved contractors for any modifications, and scheduling regular inspections. A good contractor will walk you through these clearly.
Ask About Our 10-Year Workmanship Warranty
As an Owens Corning Platinum Preferred Contractor, we offer enhanced system warranties that cover both materials and workmanship under one roof. Backed by Owens Corning. We've been installing roofs across Northeast Ohio for years, and our 152 Google reviews speak to the quality of our work. Schedule a free inspection and we'll walk you through exactly what your warranty covers.
Frequently Asked Questions
What voids a roof warranty?
The five most common warranty-voiding actions are: inadequate attic ventilation (manufacturers specify minimum intake/exhaust ratios), unauthorized roof modifications like satellite dish installations or skylight additions without manufacturer approval, power washing shingles (strips protective granules), frequent foot traffic on the roof (breaks seal strips and causes fractures), and mixing different manufacturers' products in the roofing system instead of using one manufacturer's complete system. Always check your specific warranty terms before making any changes to your roof.
How long does an Owens Corning warranty last?
Owens Corning offers several warranty tiers. Their standard shingle warranty covers manufacturing defects for the life of the shingle (25-50 years depending on the product line). Through an Owens Corning Platinum Preferred Contractor, you can get enhanced system warranties. Like the Preferred Protection Roofing System Limited Warranty. That cover both materials and workmanship. These enhanced warranties are backed by Owens Corning directly, meaning coverage continues even if the original contractor goes out of business.
Does my roof warranty transfer if I sell my house?
Most manufacturer warranties are transferable to a new homeowner, but the process and terms vary. Owens Corning warranties are transferable within the first 60 days of home sale with proper registration. After 60 days, or for subsequent transfers, coverage may be reduced. Workmanship warranties from contractors may or may not transfer. It depends on the contractor's policy. Always get transfer terms in writing before you buy or sell a home with a recently replaced roof.
Is a workmanship warranty different from a manufacturer warranty?
Yes, they cover completely different things. A manufacturer warranty covers defects in the roofing materials themselves. If the shingle fails due to a manufacturing flaw, the manufacturer replaces it. A workmanship warranty covers the quality of the installation. If the roof leaks because it was installed incorrectly (bad nailing, improper flashing, wrong underlayment), the contractor fixes it at no cost. About 80% of roof failures are installation-related, not material-related, which is why the workmanship warranty is arguably the more important of the two.
Related reading: How to Choose a Roofing Contractor in Ohio · Types of Roofing Shingles for Ohio · Roof Replacement Cost in Ohio
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