tear off

A tear off is the complete removal of all roofing materials from a structure, taking the roof down to the wood sheathing or concrete deck. This includes shingles, underlayment, flashing, and any other layers above the structural substrate. It is the most thorough form of roof replacement, distinct from reroofing over an existing roof.

Tear offs are the standard practice when damage is severe, when the substrate is compromised, or when multiple layers of old roofing exist. Building codes in many jurisdictions actually require a tear off rather than overlay when existing roof coverings already number two or more layers, since excessive weight can stress framing and moisture can become trapped beneath. A tear off also reveals the true condition of the deck, allowing contractors to spot and repair rotted sheathing, structural damage, or inadequate ventilation before installing new roofing.

Labor, weight, and debris

A tear off is labor intensive and generates substantial debris. A typical residential roof sheds 100 to 150 pounds of material per 100 square feet depending on roofing type and age. All this material must be sorted for disposal or recycling. Dumpsters or roll-off containers are standard on the job site, and the work creates significant dust and noise, making proper containment and notification of neighbors important.

The choice between a tear off and an overlay hinges on cost, code requirements, and roof condition. Tear offs cost more upfront but provide a clean slate and accurate inspection of the deck. Overlays are faster and cheaper but hide underlying problems and add weight. On pitched roofs in areas with snow load or in older buildings with marginal framing, a tear off eliminates safety risk from material accumulation.

Proper sequencing matters. Water damage and weather exposure can occur during tear off work, especially if the job stretches beyond a single day. Professional crews often complete removal and replacement of flashing and deck repairs before day's end. Roof specification and ventilation system requirements must be verified at the substrate level, since an inadequate deck or vent configuration may need correction before new roofing goes on.