Tear-off (shingles)

Definition:  A tear-off refers to the process of removing the existing roofing materials from a roof, including shingles, underlayment, and any other components, in preparation for the installation of new roofing materials. This is often done when the old roofing system is beyond repair, has multiple layers, or when a complete roof replacement is necessary to ensure proper installation and longevity of the new roof.

Read more: Average Price to Replace an Asphalt Shingles Roof in Ontario

Tear-off Process:

• Removal of Shingles and Underlayment: The tear-off process begins with the removal of the top layer of roofing material, typically shingles. This is followed by the removal of the underlayment, which is the protective layer beneath the shingles that acts as a secondary barrier against water infiltration.
• Inspection of Roof Deck: Once the old roofing materials are removed, the roof deck is inspected for any damage, such as rot or deterioration. Any necessary repairs or replacements to the roof deck are made before new roofing materials are installed.
• Clean-Up: All debris, including old shingles, nails, and underlayment, is cleared away. This ensures a clean surface for the installation of the new roofing system and reduces the risk of future problems, such as leaks or uneven roofing.

Reasons for a Tear-Off:

• Multiple Layers of Roofing: Building codes typically limit the number of roofing layers allowed on a roof, often to two layers. If a roof already has multiple layers of shingles, a tear-off is necessary before new shingles can be installed.
• Damaged or Worn-Out Roof: A tear-off is required when the existing roof is significantly damaged, has severe leaks, or shows signs of extensive wear and tear. Installing new materials over a damaged roof could lead to premature failure of the new roof.
• Upgrading Roofing System: Homeowners may opt for a tear-off when upgrading to a different roofing material, such as switching from asphalt shingles to metal roofing. Starting with a clean roof deck allows for proper installation of the new materials.

Alternatives:

• Roof Overlay: In some cases, if the existing roof is in relatively good condition and there is only one layer of roofing material, a roof overlay (adding a new layer of shingles over the old one) may be an option. However, this is not recommended when significant damage is present, or if the roof already has multiple layers.