When deciding between an overlay and a tear-off for synthetic shake roofing, it’s important to understand the basics of each method. An overlay involves installing new roofing directly over the old layer, while a tear-off means removing the existing roof before putting down the new materials. Synthetic shakes are designed to be durable and lightweight, but over time, underlying issues like rotting wood, damaged underlayment, or multiple existing layers can compromise their performance. An overlay might be a quicker and less expensive solution if the existing roof is in good shape and only a single layer. However, overlays can hide problems like weakened decking or trapped moisture. Before choosing, homeowners can do a safe DIY check by inspecting for signs such as curling, cracking, and loose shingles, or water stains inside the home. If these issues are present, a tear-off may be the better option to ensure the longevity and integrity of the new roof.
Knowing when to call a professional is essential because they can assess the roof's structure, inspect the underlayment, and verify the weight limits for overlays, as some building codes restrict adding layers beyond a certain point. Contractors will also check manufacturer warranties, as some synthetic shake brands void coverage if overlays are applied over certain conditions. When discussing options, ask your roofer if an overlay will meet local code requirements and how they will inspect for hidden damage before deciding. Additionally, inquire about the warranty implications for your specific synthetic shake product with both overlay and tear-off methods. This will help ensure your new roof lasts as expected without unexpected repairs or voided warranties.