When investing in a new roof, most homeowners in Bloomfield Hills, MI are quick to ask: “What kind of warranty comes with it?” And rightfully so—a roof warranty can protect your investment and offer peace of mind. However, many people misunderstand what these warranties actually cover—and what they don’t. In this blog, we’ll break down the types of roofing warranties, what’s included, and what to watch for when reviewing the fine print.
The Two Main Types of Roofing Warranties
Roof warranties fall into two major categories: manufacturer warranties and workmanship warranties. Each serves a different purpose and offers different kinds of protection.
1. Manufacturer Warranty
This type of warranty is provided by the roofing material manufacturer (like Owens Corning) and typically covers defects in the roofing products themselves. It applies if the shingles, underlayment, or other materials are faulty due to manufacturing errors—not if the roofer installed them incorrectly.
Key points to consider in a manufacturer warranty:
- Length of coverage: Basic warranties can range from 20 to 50 years or more, depending on the product.
- Prorated vs. non-prorated:
Some warranties decrease in value over time, while others offer full replacement for a specified period.
- Material-only vs. system warranties: Higher-end options may cover the entire roofing system (including accessories like ridge caps and underlayment), not just shingles.
- Transferability:
Can the warranty transfer to a new homeowner? This is a great selling point if you plan to move.
2. Workmanship Warranty
This warranty is offered by the roofing contractor and covers installation errors. Even the best materials will fail if installed improperly. That’s why a workmanship warranty is critical.
A reputable roofing company should stand behind their work with a warranty that lasts 5 to 15 years, or even longer. Poor flashing, incorrect nailing, or bad sealing can all cause leaks and damage—but a solid workmanship warranty ensures the contractor is responsible for fixing those issues at no additional cost.
180 Contractors Roofing & Siding is known throughout Bloomfield Hills, MI for delivering quality installations backed by strong workmanship guarantees and full transparency from start to finish.
What’s Typically Covered Under Warranties?
If your warranty is active and the issue falls under covered conditions, here’s what you can usually expect:
- Repair or replacement of defective shingles
- Replacement of underlayment or accessories (if covered under a full-system warranty)
- Cost of labor for repair or replacement (for some manufacturer warranties or when paired with workmanship coverage)
- Installation correction (under the contractor’s workmanship warranty)
Some enhanced manufacturer warranties—like Owens Corning’s Preferred Protection Roofing System Limited Warranty—cover both labor and material for up to 50 years when installed by a certified contractor.
What Warranties Don’t Cover
This is where many homeowners get tripped up. Standard warranties often exclude common issues like:
- Damage from improper installation (unless covered under a workmanship warranty)
- Storm or weather damage (which should be covered by your homeowners insurance, not the manufacturer)
- Foot traffic damage, animal damage, or falling debris
- Mold or mildew caused by poor ventilation
- Interior damage to walls, ceilings, or personal items
- Regular wear and tear due to age
It’s also important to know that most warranties won’t cover any damage if you’ve altered the roof system—such as adding skylights or satellite dishes—without professional assistance.
Keeping Your Warranty Valid
Even if your roof is covered by a robust warranty, failing to follow certain conditions could void it. Common pitfalls include:
- Not using the full recommended system from one brand
- Failing to ventilate the attic properly
- Installing over old roofing materials without tear-off (unless approved)
- Not registering your warranty after installation
- Hiring a contractor who isn’t certified by the manufacturer
To protect your investment, work only with qualified installers who follow all manufacturer guidelines and take care of the paperwork on your behalf.
Why Certification Matters
Contractors who are certified by manufacturers like Owens Corning can offer enhanced warranty options that are unavailable to uncertified roofers. These warranties typically come with longer non-prorated periods, broader coverage, and include both material and labor.
By working with a certified contractor like 180 Contractors Roofing & Siding, homeowners in Bloomfield Hills, MI gain access to top-tier warranties and expert installation practices that ensure long-lasting performance.
Final Thoughts
Roof warranties offer important protection—but only if you understand what they cover and how to keep them valid. The best way to ensure you’re protected is by choosing a certified contractor, reading the fine print, and asking questions before your project begins.
Remember, your warranty is only as good as the materials and workmanship behind it—so invest wisely and protect your home for decades to come.
Read also our blog:
Tips for Finding the Right Roofing Contractor
