Tear-Off vs overlay (layover) roofing
Last updated · Costs & the replacement process
Short answer: A tear-off strips existing roofing to the deck so new underlayment and flashings go on a known surface. An overlay (layover) installs new shingles over old ones where code allows — cheaper upfront, riskier long-term.
Limits
Layer counts are limited by code. Overlays hide rotten deck and add weight.
Local building codes vary. Always verify requirements with your local building department and follow the manufacturer's installation instructions for the products installed.
How to compare bids fairly
- Same tear-off scope and layer count assumptions
- Named underlayment and ice-barrier products
- New flashings vs. reuse called out
- Ventilation plan
- Deck replacement price per sheet
- Warranty tier and who registers it
- Permit and dump fees included
Timeline expectations
Crew days on site are only part of the calendar. Permits, material lead times, insurance supplements, and weather all stretch projects. Ask for a written sequence: deposit, material delivery, tear-off, dry-in, final, punch list.
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Sources
Sources checked November 4, 2026. Estimates are not quotes. Roofing, insurance, and legal details vary. Confirm with your contractor, insurer, or attorney.