A “Tear-Off” refers to the complete removal of all existing roofing materials down to the structural decking. While it is significantly more expensive and labor-intensive than a “Recover” (overlaying new shingles on top of old ones), it is the only way to guarantee the integrity of your roof.
1. Tear-Off vs. Overlay (Recover)
Homeowners are often tempted to save money by installing a second layer of shingles over the existing roof. While this is legal in many jurisdictions (up to two layers), we generally advise against it.
| Factor | Tear-Off (Recommended) | Overlay (Risky) |
|---|---|---|
| Deck Inspection | Full Visibility | Impossible |
| Weight | Resets to zero | Doubles dead load |
| Warranty | Full Manufacturer Coverage | Often Voided/Limited |
| Cost | Higher (Labor + Dump) | Lower |
2. The Process: What to Expect
A tear-off is a messy, loud, and destructive process. It is the primary reason dumpster fees are such a large line item in your quote.
- Debris Management: Thousands of pounds of asphalt, nails, and felt paper are scraped off.
- Landscape Protection: Contractors must use tarps to catch falling nails and debris to protect shrubs and driveways.
- Nail Removal: Ideally, old fasteners are pulled out. If pounded flat, they can back out over time and puncture the new shingles from underneath.
3. The Hidden Cost: Decking Rot
The biggest financial variable in a tear-off is the condition of the plywood decking. This is a cost that cannot be calculated until the old roof is gone.
Most contracts include a “per sheet” price for replacing rotten plywood (e.g., $90 – $120 per sheet). If your tear-off reveals water damage, this will be added to your final invoice.
4. Why It Is Necessary
You cannot flash a roof properly if you don’t start from the deck. Vital components like Ice & Water Shield must be adhered directly to the wood to function. Installing them over old shingles renders them useless.