Torch-down roofing is a type of modified bitumen roofing often used on flat or low-slope roofs. When replacing or repairing this roof, you have two options: overlay or tear-off. An overlay involves placing a new layer of torch-down material directly over the old one, while a tear-off means completely removing the existing roof before installing the new layer. Overlay can be quicker and less expensive, but it may hide existing damage and add weight to the roof structure. Tear-off is more thorough, allowing for inspection and repair of the deck beneath, but it takes more time and costs more. Overlays might be suitable if the current roof is in good condition without leaks or soft spots, but if you notice bubbling, cracking, or significant wear, a tear-off is usually safer.
To check your roof before deciding, you can walk the roof carefully if it is safe to do so, looking for soft or spongy areas, curling edges, or any signs of water intrusion inside your home like stains or mold. However, do not attempt to torch or repair torch-down roofing yourself unless you have experience, since the installation involves an open flame and can be hazardous. When calling a roofer, ask if they recommend an overlay or tear-off for your specific situation and whether the warranty will cover both options. A good question is, “Will you inspect the roof deck during installation, and what conditions would require a tear-off?” This shows you’re focused on long-term durability rather than just upfront cost.