Why Roof Warranties Matter More Than You Think
A roof warranty is defined as a guarantee from either the manufacturer or the installer (or both) that covers defects in materials or workmanship for a specified period. The average homeowner spends $8,400 to $12,600 on a roof replacement. That investment deserves real protection. Yet many homeowners do not fully understand what their roof warranty covers.
This guide breaks down the three types of roof warranties, what voids them, and what to look for before you sign.
The Three Types of Roof Warranties
1. Manufacturer Material Warranty
This warranty covers defects in the roofing materials themselves, such as premature cracking, splitting, or granule loss. Most asphalt shingle manufacturers offer 25-year to lifetime limited warranties on their products. Owens Corning Duration shingles, for example, carry a lifetime limited warranty against manufacturing defects.
Key detail: "lifetime" in roofing warranties typically means the reasonable useful life of the product, not your lifetime. Read the fine print.
2. Workmanship Warranty (Contractor)
This covers installation errors: improperly nailed shingles, incorrect flashing, missing underlayment. Workmanship warranties vary wildly. Some contractors offer 1 year. Others offer 5. SquareDash offers a 25-year workmanship warranty, which is among the strongest in the industry.
3. System Warranty (Enhanced)
When a contractor is certified by a manufacturer (like Owens Corning Platinum Preferred), you can qualify for a system warranty that covers both materials and labor. These are the strongest warranties available because the manufacturer stands behind the entire job, not just the shingles.
What Voids a Roof Warranty
- Improper ventilation: The number one warranty-voiding issue. If your attic is not properly ventilated, trapped heat degrades shingles from below. See our ventilation guide.
- Unauthorized modifications: Adding satellite dishes, solar panels, or skylights without following manufacturer guidelines can void coverage.
- Pressure washing: Power-washing shingles strips granules and voids most warranties.
- Layering over existing shingles: Installing new shingles over old ones (an overlay) voids many manufacturer warranties.
- Lack of maintenance: Failing to address moss growth, clogged gutters, or debris accumulation can be grounds for warranty denial.
Are Roof Warranties Transferable?
Most manufacturer warranties are transferable to a new homeowner one time, usually within 60 days of home sale. Workmanship warranties are often non-transferable unless the contractor specifically allows it. SquareDash warranties are fully transferable, which adds resale value to your home.
What to Look for in a Roof Warranty
- Length: At least 25 years for materials, at least 10 years for workmanship.
- Coverage scope: Does it cover labor costs for repairs, or just replacement materials?
- Prorated vs non-prorated: Non-prorated is better. Prorated means the coverage decreases each year.
- Transferability: Important if you might sell within the warranty period.
- Exclusions: Read every exclusion. Acts of God, improper maintenance, and unauthorized modifications are standard.
Bottom line: The warranty is only as good as the company behind it. A 50-year warranty from a contractor who might not exist in 5 years is worthless. Choose a warrantor with proven financial stability. Get your SquareDash estimate and see our 25-year workmanship warranty details.
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Alexander Chua
Alexander is a co-founder of SquareDash and writes about roofing technology, costs, and the homeowner experience.