You can choose between a complete tear-off or a roof-over when it comes to old asphalt shingles. When layering over the old roofing, the installer simply places the new shingles over the existing ones. One the other hand, with a total tear-off, your contractor removes the old shingles before installing your new roof.
The main reason some prefer layering shingles is because it costs less. With a roof-over, you can save a little on cleanup, disposal costs and dumpster rentals. This job isn’t as messy compared to a complete tear-off. Since it’s not as labor-intensive, your roofer can finish the replacement faster.
Your contractor won’t be able to detect damage and perform necessary roof repair without removing the old roofing. Behind the old shingles may be leaks, damaged flashing, rotted wood and organic growth. These problems can’t be fixed or prevented unless your roofer sees them.
Multiple layers of shingles can add weight and stress to the roof’s structure. This can be an issue if you live in a rainy area. Keep in mind that standard 30-square asphalt roofing utilizes 90 bundles of shingles, and a bundle of shingles weighs around 100 pounds. It means that you’re placing around 9,000 more pounds of load on your roof.
Further, having layers of shingles will make your roof warmer as the heat gets trapped between the layers. Excessive heat can make your shingles age faster.
You might want to reconsider getting a roof-over if you’re thinking of selling your home in the future. A home inspector will likely see layered shingles as a downside to your home because it could mean possible issues that the new owner will have to address.
Pressure Point Roofing, Inc. is here for all your residential and commercial roofing needs. We specialize in roof maintenance, repair and replacement. Call us at (541) 772-1945, or fill out our online form to schedule a consultation. We work with homeowners in Medford, OR.