Blog / How to Read Your Roofing Warranty
How to Read Your Roofing Warranty (Without a Law Degree)
Published March 2026 ยท 5 min read
You have a roofing warranty. You probably got a paper copy when the roof was installed. You probably have not read it. Here is what it actually says, in plain English.
Two Warranties, Not One
Most homeowners think they have "a warranty." You actually have two. They cover different things, come from different sources, and have different terms.
Workmanship warranty comes from the contractor who installed your roof. It covers how the roof was put on. If the flashing was installed wrong, if the shingles were nailed incorrectly, or if the sealing fails because of a labor mistake, this warranty covers it.
Manufacturer warranty comes from the company that made the materials. GAF, CertainTeed, Owens Corning, and others all offer their own warranties. This covers defects in the materials themselves. If a shingle cracks because of a manufacturing flaw, the manufacturer replaces it.
You need both. A perfectly manufactured shingle installed badly will fail. A perfectly installed roof with defective materials will also fail. Each warranty catches a different type of problem.
What Workmanship Warranty Covers
Your contractor's workmanship warranty covers installation defects. Here is what that means in practice:
- Flashing failure around chimneys, vents, and skylights.
- Improper sealing at valleys, ridges, and edges.
- Fastening errors. Nails in the wrong spot, wrong depth, or wrong pattern.
- Underlayment problems caused by installation mistakes.
- Leaks traced back to how the roof was assembled.
Our workmanship warranty lasts 25 years. It transfers to new owners if you sell your home. Not every contractor offers this. Some offer 5 years. Some offer 10. Ask before you hire. Learn more on our warranties page.
The length of the workmanship warranty tells you something about the contractor. A company that stands behind their work for 25 years is confident in their crews. A company that only offers 2 years is hedging.
What Manufacturer Warranty Covers
The manufacturer warranty covers defects in the roofing materials. If a shingle batch was bad, if the granules fall off prematurely, or if the material degrades faster than it should, the manufacturer is on the hook.
Most manufacturer warranties on asphalt shingles are 25 to 50 years. But read the fine print. Here is where it gets tricky:
- Full coverage period. The first 10 to 15 years are usually fully covered. If something fails, you get a full replacement at no cost.
- Prorated period. After the initial period, coverage is prorated. A 30-year shingle that fails in year 20 might only get 33% of its value covered. You pay the rest.
- Labor vs. materials. Many manufacturer warranties only cover the cost of the materials, not the labor to install them. Labor is often the bigger expense. Some premium warranties include labor coverage, but you have to specifically request and pay for that upgrade.
A "50-year warranty" does not mean you get a free roof for 50 years. It means the materials are warranted against defects, with declining coverage over time. Read the schedule to know what you actually get in year 15, year 25, and year 40.
What Voids Your Warranty
This is the section most homeowners skip. And it is the section that matters most when you need to make a claim.
No maintenance. Both warranties expect you to maintain your roof. If you never clean your gutters, never remove debris, and never address minor issues, the warranty company can argue you caused the failure through neglect.
Unauthorized modifications. If you or another contractor drills holes for a satellite dish, adds a skylight, or attaches solar panels without following the manufacturer's guidelines, you may void the warranty on the affected area.
Pressure washing. Yes, this is a real one. High-pressure washing strips granules off asphalt shingles and can break the seal between layers. Many manufacturer warranties specifically exclude damage from pressure washing. Use low-pressure methods instead.
Walking on tile roofs. Concrete and clay tiles crack under foot traffic. If cracked tiles are traced to someone walking on the roof, the manufacturer will not cover it. This is common in Bay Area neighborhoods with tile roofs, like Saratoga and Los Gatos.
Letting another contractor work on it. If you hire a different contractor to do repairs or modifications, and they cause damage, your original workmanship warranty may not cover it. Check before you let anyone else touch your roof.
How to Protect Your Coverage
Keeping your warranty valid is straightforward. You just have to be intentional about it.
- Get annual inspections. A yearly roof inspection creates a maintenance record that proves you cared for your roof. It also catches small issues before they become big ones.
- Keep records. Save every inspection report, maintenance receipt, and repair invoice. If you ever need to file a warranty claim, this paper trail is your proof.
- Use your original contractor for repairs. When possible, call the contractor who installed the roof. They know the system, the materials, and the warranty terms. Using someone else risks voiding coverage.
- Schedule regular maintenance. Clean gutters twice a year. Remove debris. Trim overhanging branches. These small steps keep your warranty intact and extend your roof's life.
- Read the warranty document. Spend 15 minutes reading it. Know what is covered, what is excluded, and what you need to do to keep it active. It is the most valuable 15 minutes you will spend on your roof.