A “recover” (or layover) puts new roofing on top of the old roof instead of tearing it off. California allows it in limited cases. The rules are in Section R908 of the California Residential Code.
When is a recover not allowed?
R908.4 does not permit a new roof covering over an existing one:
- Where the existing roof or roof covering is water-soaked or has deteriorated.
- Where the existing covering is slate, clay, cement or asbestos-cement tile.
- Where the existing roof already has two or more applications of any type of roof covering.
Covering wood shingles or shakes has its own rule (R908.4.1): if the new roof creates a combustible concealed space, the old surface must first be covered with gypsum board, mineral fiber, glass fiber or another approved material.
What counts as a roof replacement?
R908.3 says a roof replacement includes removing the existing layers of roof covering down to the roof deck. That is the job most estimates mean by “tear-off.”
Why do we usually recommend a tear-off in the Bay Area?
- Many older roofs already have two layers, which rules out another recover.
- You cannot see the deck through a recover. Soft or rotted sheathing stays hidden under the new roof. With a tear-off we photograph the deck and repair it before the underlayment goes on.
- Flashings get rebuilt. R908.5 requires rusted, damaged or deteriorated flashings to be replaced, and most leaks start at flashings.
- Fire zones. On properties in a fire hazard severity zone, California Wildland-Urban Interface Code Section 507 requires the roof covering to meet the new-construction standard (Class A) when 50% or more of the roof is replaced in 12 months.
A recover can make sense on a single-layer roof with a sound, dry deck. We tell you in the inspection whether yours qualifies. For costs, see roof tear-off cost in the Bay Area and how much a new roof costs.
Request a free inspection and written estimate or call (415) 410-7917. Related: roof replacement.
Sources: 2025 California Residential Code R908, reroofing (GoCodebook); 2025 California WUI Code §507 (GoCodebook).
Related services and local pages
- Roof Replacement
- New Roof Installation
- Roofing Permits in the Bay Area — How We Handle Yours
- Roofing materials guide
- Find your city: Service Areas — Bay Area Roofing
Sources
- 2025 California Residential Code R908, reroofing (code text on GoCodebook)
- 2025 California Wildland-Urban Interface Code §507, roof replacement (code text on GoCodebook)
- CAL FIRE Office of the State Fire Marshal: Fire Hazard Severity Zone maps
Rules and maps change; confirm requirements for your address with your city or county building department.
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