Completed operations coverage and roofing warranties serve fundamentally different purposes, and confusing the two is one of the most common and costly mistakes roofing contractors make. Your completed operations coverage, which is part of your commercial general liability (CGL) policy, protects you against third-party claims for bodily injury and property damage caused by defects in your completed work. A roofing warranty, whether from the manufacturer or your own company, is a contractual promise to repair or replace defective roofing materials or workmanship within a specified time frame. These are separate obligations that do not substitute for each other.
Your CGL completed operations coverage responds when a defect in your completed roofing work causes consequential damage to third-party property or injures a person. For example, if a flashing detail you installed fails and allows water to penetrate the building, causing $80,000 in interior damage to drywall, flooring, and electrical systems, your completed operations coverage pays for the interior damage and any associated bodily injury claims. However, it does not pay to remove and replace the defective flashing or the roof section that failed. The cost of repairing your own defective work is excluded under the standard CGL policy's "your work" exclusion.
A workmanship warranty, by contrast, is your contractual commitment to go back and fix the defective work itself. If you offer a five-year workmanship warranty and the flashing fails in year three, your warranty obligates you to repair the flashing at your own expense. The warranty covers the cost of labor and materials to correct your work, but it does not cover the consequential damage to the building interior. That is where your completed operations coverage picks up.
Manufacturer warranties cover defects in the roofing materials themselves, not your installation. A 30-year manufacturer shingle warranty covers premature deterioration, granule loss, or manufacturing defects in the shingle product. If the shingles fail due to a manufacturing defect, the manufacturer will typically provide replacement materials, though labor costs may or may not be included depending on the warranty terms. If the shingles fail because you installed them improperly, such as incorrect nail placement or inadequate ventilation, the manufacturer warranty is void, and the claim falls on your workmanship warranty and CGL policy.
The financial exposure from this gap is significant. Consider a commercial flat roof installation where your crew applies a single-ply membrane with insufficient adhesive coverage. Two years after completion, wind uplift peels the membrane off a 10,000-square-foot section, exposing the building interior to rain. The cost to remove and reinstall the membrane might be $80,000, which comes out of your own pocket under your workmanship warranty. The consequential water damage to the building interior, including damaged inventory, equipment, tenant improvements, and business interruption losses, could easily reach $500,000 or more. Your completed operations coverage pays for the consequential damage, but only if your policy is still in force and the claim falls within the policy's terms.
To manage both exposures effectively, you should structure your workmanship warranties carefully. Avoid offering unlimited warranty terms that expose you to liability indefinitely. Most experienced roofing contractors offer workmanship warranties of two to five years for residential work and five to ten years for commercial work. Clearly define what the warranty covers and excludes, including exclusions for normal wear and tear, damage from acts of nature, and failure to maintain the roof system properly.
On the insurance side, maintain continuous CGL coverage with the completed operations section for at least the duration of the applicable statute of repose in your state, which typically ranges from four to twelve years. Ensure your policy does not contain a sunset clause or completed operations exclusion that would eliminate this coverage prematurely. Work with your broker to verify that your completed operations aggregate limit is sufficient to cover your total volume of completed work across all active warranty and statute of repose periods.