tear-off
The demolition phase of a reroofing job, wherein the old shingles or other materials are torn off in preparation for the installation of new ones.
tear-off: stripping an old roof down to the deck
A tear-off is the demolition phase of roof replacement where existing shingles, underlayment, and other roofing materials are removed down to the structural deck, sheathing, or in some cases down to the rafters. This exposes the substrate for inspection and allows installation of new roofing materials. The tear-off typically precedes all other work in a reroofing project and can account for 10 to 20 percent of total project labor.
The scope varies by what sits on the deck. On asphalt shingle roofs, workers remove shingles, felt or synthetic underlayment, and nails or fasteners. On built-up roofs or modified bitumen systems, multiple tar-saturated felt layers and gravel must come off. On metal roofs, fasteners, panels, and sometimes the underlying membrane get stripped. The depth of tear-off depends on building codes, insurance requirements, local frost lines, and structural condition. Some jurisdictions limit the number of existing layers allowed before a full tear-off becomes mandatory.
Debris volume is substantial: a typical 2,000 square foot roof may generate 5 to 10 tons of waste. This debris goes into a dumpster or roll-off container sized according to project scope. Workers typically use forks, pry bars, and roofing shovels to loosen and pitch materials to the ground or into containers below. Falls, puncture wounds from nails, and eye injuries from flying debris are the primary hazards. A safety perimeter, netting, and ground spotters are standard precautions on occupied properties.
Why inspection matters during tear-off
Tear-off work reveals hidden damage that quotes and inspections missed. Rotted decking, active leaks, mold, missing sheathing, and structural weakness become visible only once old materials come off. Contractors typically charge change orders for discovered rot repair, which can delay projects by days. This is why experienced roofers budget time and contingency for unexpected findings.
The term "tear-off" distinguishes this total removal approach from "overlay," where new materials are installed directly over existing roofing. Though overlays cost less upfront, they hide problems, add weight, reduce durability of new materials, and are increasingly prohibited by code. A tear-off costs more but ensures a sound substrate and a roofing system designed to perform.