A roof tear-off is the complete removal of the old roofing materials down to the bare wood decking before a new roof is installed. Stripping everything off lets the crew inspect and repair the decking, install fresh underlayment, and start the new roof on a sound base. A full tear-off is the proper way to replace a roof, even though it costs more in labor and disposal than simply layering new shingles over the old ones.
When a roof is replaced the right way, the first job is taking the old one off entirely. Crews strip the worn shingles and underlayment all the way down to the wood decking, then haul the debris away to be disposed of. Only with the deck exposed can they see and fix what is underneath, replace the underlayment, and build the new roof on a clean, solid foundation.
The tear-off step is where a lot of a roof's long-term reliability is decided. With the old roof gone, the crew can find and replace rotted decking, reset or upgrade the flashing, and lay down a complete new underlayment. None of that is possible if the old roof stays in place. This is also a labor-heavy, dirty stage, which is part of why a thorough replacement costs more than a quick cover-up job.
For a homeowner, the takeaway is to favor a full tear-off over an overlay in nearly every case. A tear-off may cost more today, but it ensures the new roof sits on sound wood, with fresh underlayment and proper flashing, so it lasts its full life. An estimate that includes a clear tear-off and a per-sheet decking price is usually a more honest value than a cheaper bid that quietly roofs over existing problems.
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