Tab shingles are a popular roofing option made from asphalt, featuring a layered, flat panel design that offers a classic look. When reroofing with tab shingles, homeowners and roofers often face the decision between overlaying new shingles on top of the old ones or performing a full tear-off of the existing roof. Overlaying means installing new shingles directly over the old layer, which is faster and less expensive upfront. However, this method can hide potential problems like damaged decking or underlying leaks and adds extra weight to the roof structure, potentially shortening the lifespan of the new shingles. Tear-off involves removing the old shingles and inspecting the roof decking thoroughly. While it’s more labor-intensive and costly, tear-off helps address hidden issues, ensures proper ventilation, and provides a cleaner, longer-lasting surface for the new shingles.
If you’re considering either method, start with a simple visual check of your roof’s overall condition. Look for signs like curling, cracking, or missing shingles, and check the attic for any daylight or water stains, which hint at roof problems beneath. For a safe DIY check, you can gently tap the roof surface or look for soft spots but avoid walking extensively on the roof to prevent accidental damage. When these signs appear or if you’re unsure about your roof’s structure, it’s time to call a professional roofer. Ask your contractor about their experience with tear-offs versus overlays in your climate and roofing material, and how they will check and ensure that the roof decking is sound. Also, inquire about how their warranty may be affected by the installation method, since overlays might have shorter coverage than tear-offs. This information will help you make a clear, informed decision that balances cost, safety, and roof longevity.