What Your Roof Warranty Actually Says: A Plain-Language Guide to Common Terms

April 2026 · Colorado Roofing Association

Most homeowners sign a roof warranty without knowing what the words inside it mean. The Colorado Roofing Association put this guide together to change that. Below are eight of the most common warranty terms for residential asphalt shingle roofs, explained in plain language.

This guide covers residential steep-slope roofing. Commercial low-slope warranties operate under a different framework, one that CRA addresses separately in its guide to understanding total system warranties.

What Is a Limited Lifetime Warranty?

A limited lifetime warranty is a promise from the shingle manufacturer that lasts as long as the expected service life of the roof, typically 25 to 50 years. It does not mean the warranty lasts forever.

The word “limited” is important. It means the warranty has rules and covers only certain problems. The word “lifetime” refers to the expected life of the roof, not the life of the homeowner.

Most limited lifetime warranties also pay less over time. The older the roof gets, the less the warranty covers. This is called proration, and it is explained in more detail below.

What Is a Manufacturing Defect?

A manufacturing defect is a flaw that existed when the shingle left the factory, such as cracking, blistering, or adhesion failure caused by faulty materials or production errors. This is distinct from storm damage or normal aging; the problem was built into the product from day one.

Shingle manufacturer warranties are designed primarily to cover manufacturing defects. If a shingle cracks or falls apart because of how it was made, that is a manufacturing defect. If it cracks because a tree branch fell on it, that is damage. Damage is handled by homeowner’s insurance, not the warranty.

When a homeowner files a warranty claim, the manufacturer evaluates whether the problem was a manufacturing defect or something else. That determination affects whether the claim is approved.

What Are Granules?

Granules are tiny, rough pieces that coat the top of asphalt shingles. They look and feel like coarse sand and protect the shingle from sun, rain, and heat.

Think of granules like sunscreen for the shingle. When they are present, the shingle stays protected. When they fall off too quickly, the shingle breaks down sooner. Some granule loss is normal over many years. If granules wash off quickly after a new roof is installed, that can be a sign of a manufacturing defect.

The National Roofing Contractors Association (NRCA) notes that granule loss rates are one of the standard items manufacturers examine when a warranty claim is filed. Faster-than-normal loss can support a defect claim. Loss that matches expected aging patterns generally does not.

What Is Blistering?

Blistering is when small bubbles form on the surface of a shingle. It can result from heat or moisture trapped inside the shingle and is sometimes linked to inadequate attic ventilation.

Some blistering is covered by a warranty and some is not. Blistering that originated from a manufacturing problem is generally a covered defect. Blistering that developed because ventilation requirements were not met, or from sustained heat exposure over time, is often excluded.

When blistering opens up, it exposes the asphalt layer underneath and can accelerate how quickly a roof ages. Manufacturers examine blistering closely when reviewing claims because the cause determines whether coverage applies.

What Is Leakage as Defined in a Warranty?

In a manufacturer’s warranty, leakage means water getting through the roof because of a defect in the materials themselves, not because of how the roof was installed. Not every roof leak qualifies as a manufacturer warranty claim.

A manufacturer warranty covers leaks caused by defective materials. That means a shingle that failed because of faulty production, not because of a storm or aging. Storm damage is a homeowner's insurance claim. An installation error, such as improperly seated flashing or overdriven fasteners, falls under the contractor's workmanship warranty. Each cause points to a different party and a different claims process.

CRA’s resource on hailstorms and your roof covers how to tell the difference after a storm. Warranty documents often define leakage narrowly, sometimes requiring that water enter a living space rather than just an attic or wall cavity. Reading the exact definition in the warranty document matters when deciding whether and how to file a claim.

What Is Proration?

Proration means the warranty pays less as the roof gets older. In the early years, the warranty may cover most or all of the cost. By year 20, it might cover only a fraction.

A 30-year prorated warranty might cover 100 percent of costs in year one, 50 percent by year 15, and 20 percent by year 25. The homeowner pays the remainder out of pocket each time a claim is paid.

Some warranties include a non-prorated period at the start, during which coverage stays at 100 percent. After that period ends, proration begins. A warranty that says “non-prorated for 10 years” provides full coverage for the first decade before coverage amounts begin to decrease.

What Is Workmanship?

Workmanship refers to how well a roof was installed. A workmanship warranty covers mistakes the contractor made during the job. It comes from the contractor, not the manufacturer.

The manufacturer is responsible for the quality of the shingles. The contractor is responsible for the quality of the installation. If flashing comes loose because it was not properly attached, that is a workmanship issue. If a shingle cracks because it was flawed when it came off the production line, that is a manufacturer issue.

Workmanship warranty terms vary by contractor and project type. Homeowners should ask for the warranty term and scope of coverage in writing before signing a contract. If a contractor goes out of business, the workmanship warranty generally goes with them, which is one reason verifiable track record and business stability matter when making a hiring decision. CRA’s resources on roof maintenance cover what to watch for after a new roof is installed.

What Is an Authorized Contractor?

Standard manufacturer warranties for asphalt shingles do not require the installing contractor to hold a manufacturer credential. A properly licensed and insured roofer can install asphalt shingles without voiding the manufacturer’s standard product warranty solely because they are not manufacturer-credentialed.

Extended or upgraded warranties are a different matter. Programs such as GAF Master Elite, Owens Corning Platinum Preferred, and CertainTeed SELECT ShingleMaster offer longer terms and broader coverage, but they require the contractor to hold manufacturer certification. Only credentialed contractors can offer these extended warranty products. A homeowner who wants extended coverage and hires a non-credentialed contractor may find those extended terms are simply not available, regardless of how well the work was performed.

Homeowners who want extended warranty coverage should verify that their contractor holds the relevant credential before signing a contract. CRA’s resources on selecting a professional roofing contractor include guidance on what to ask and verify before work begins.

Finding a Contractor Who Knows the Warranty

The Colorado Roofing Association recommends that homeowners thoroughly review the manufacturer’s warranty before and after signing a roofing contract. A good contractor will provide warranty documentation and can answer questions about what the terms cover.

Colorado homeowners can search CRA’s directory of vetted, licensed, and insured roofing contractors at coloradoroofing.org.

Commercial and low-slope roofing warranties operate under a different set of rules than the residential shingle warranties covered in this guide. CRA’s separate resource on understanding total system NDL warranties is written for commercial building owners and property managers navigating those differences.