When deciding between an overlay and a tear-off for a torch-down roof, it’s important to understand the implications of each option. An overlay involves installing the new torch-down layer directly on top of the existing roof, which can save time and money by avoiding the labor of removing the old material. However, overlays add extra weight to the roof structure and can hide problems like rot, moisture damage, or compromised decking beneath the old membrane. Small imperfections left under an overlay may worsen over time, potentially shortening the new roof’s lifespan. To gauge if an overlay is viable, you can perform a simple inspection by checking for soft spots on the roof deck, water stains in the attic, or bubbling and cracking on the current torch-down surface. If these signs are present, a tear-off is generally the safer option to ensure a stable and long-lasting base.
Tear-off means stripping the old torch-down material completely before applying the new layer. This process is more labor-intensive and costly but allows for a thorough inspection and repair of the decking and underlayment, which can extend the overall life of your roofing system. It is wise to call a professional roofer if you notice extensive damage during your simple checks or if you’re unsure about the roof’s condition. When speaking with a contractor, ask how they will assess the decking's condition and whether they include moisture barriers or insulation upgrades during the tear-off process. Also, inquire about how the chosen method may affect your roof warranty, as some manufacturers require a full tear-off for warranty coverage of torch-down roofs. This will help you balance upfront costs with long-term protection for your home.