When deciding between overlay and tear-off for a zinc roof, it’s important to understand the basics of each option and the condition of your current roofing. An overlay involves installing the new zinc roofing directly over the old one, which can be faster and less expensive because it avoids the labor and disposal costs of removal. However, overlays are only suitable if the existing roof is in good shape without significant damage or structural issues. A tear-off, on the other hand, means completely removing the old roofing down to the decking before installing the new zinc. This option provides a fresh start, ensuring any hidden damage or moisture issues are addressed early. Overlays can trap problems underneath, reducing the lifespan of the new roof and potentially voiding manufacturer warranties if not done according to code or zinc roofing manufacturer guidelines. Simple checks you can do include inspecting the roof surface for signs of rot, mold, or soft spots, and checking for multiple roofing layers, which could make overlays unsafe or impractical.
Before deciding, it’s best to carefully assess the overall health of your roof. If the decking is damaged or the current roof has more than two layers, a tear-off is usually the safer choice, and often required by building codes. Performing a quick walk-around can reveal visible issues like leaks, curling, or heavy corrosion that suggest tear-off. Always consult a professional roofer experienced with zinc materials to confirm your findings, as they can safely lift sections for closer inspection and verify compatibility with manufacturers’ requirements. When reaching out to contractors, ask, “How will you confirm whether an overlay is structurally and code-compliant for zinc roofing?” and “Can you guarantee that the warranty will remain valid with the installation method you recommend?” These questions ensure your roofer considers both performance and protection aspects, helping you make a confident and informed choice.