Solar modules sitting on a structurally sound roof, flashed like any other penetration, do not “eat” the covering. The hardware does the damage when someone lags through shingles or tile and relies on caulk, or when the roof already needed a tear-off during the array’s life.
Top Pro Roofing SD refers licensed independent C-39 roofers. We do not install solar, pull modules, or set detach-and-reset prices. Call (760) 750-5557. Solar electrical work is typically a C-46 classification. Confirm both licenses when two trades share one roof.
Sequence before the first mount: preparing a San Diego roof for solar. Panels already up, covering failing: solar removal during a reroof. A different choice: why people remove solar.
The failures that show up after an array
These are construction defects and sequencing errors, not a property of silicon.
Mounting-foot leaks. Traditional racking uses an L-foot or similar lag into a rafter, then a flashing kit. On asphalt, the plate tucks under the course above. On tile, a replacement flashing plate replaces the displaced tile. Sealant-only lags fail when the caulk cooks. By the time the ceiling stains, the deck under the foot may already be wet. Coastal Encinitas and Cardiff salt does not help exposed fasteners.
Underlayment that ages out first. Ask the module maker for the current warranty term. Ask the roofer whether the tile, felt, or underlayment under the array is already mid-life. The weather layer can fail while the panels still produce. The honest repair is then tile lift-and-relay plus a module reset. We will not invent a combined dollar total. Get both trades in writing.
Wind on the array edge. Santa Ana and other high-wind events load corner modules and long rail spans. East County and higher elevations see more of that load. A loose corner is not “just a panel.” It is flashing, fasteners, and a reason to inspect the rest of the array. Specify listed hardware and an engineered layout. Do not treat a blog wind number as a design value.
New penetrations that are not boots. Conduit through the deck needs a listed boot and flashing, the same idea as a plumbing vent. Caulk around a hole is not that detail. The indoor drip can land far from the array. Liability follows who made the hole. Look up both companies on the CSLB license search.
Roof-manufacturer warranties. GAF, Owens Corning, CertainTeed, and similar documents often require approved flashing and a qualified roofer for penetrations. A C-46 crew that only caulks can put a later claim at risk. Read the actual warranty for that product line. We do not certify that any named SKU survives a given racking brand.
Mounting method by covering
| Method | Covering | What to insist on |
|---|---|---|
| Flashed L-foot | Architectural shingle | Flashing plate under the upper course, lag into structure, no sealant-only lag |
| Sealant-only lag | Architectural shingle | Treat as a leak path. Ask why flashing was skipped |
| Tile-replacement flashing | Concrete or clay tile | Displaced tile replaced by a listed plate, not a drilled and caulked tile |
| Hook through sealed tile | Concrete or clay tile | Higher leak and breakage risk. Ask for the plate method instead |
| Seam clamp | Standing-seam metal | Listed clamp for that panel profile. No unnecessary penetration |
| Ballast or adhered rack | Low-slope | Dead load, parapet, and drainage on the structural and roofing review |
Standing-seam metal is usually the simplest host because clamps sit on the seam. Exposed-fastener metal is not the same product. Low-slope ballasted systems skip many holes and add weight. See flat roofing.
What “the solar company warrants the roof” actually means
Ask, in writing, before you sign:
- Who backs the roof language, the installer or a third party, and what happens if that company is gone.
- Whether detach-and-reset during a later reroof is included, excluded, or priced as a future extra.
- Whether the language covers a voided shingle or tile manufacturer warranty. Most solar paperwork does not.
A locked future reset rate in the solar contract is a question worth asking. It is not a number this page can invent. Same for per-panel service rates.
When the array is not the problem
Install on a covering and underlayment with remaining life that matches the array, not a roof already in the replacement window. For asphalt, that often means a relatively new roof. For tile, pull a tile and look at the underlayment. If the weather layer is short, reroof first. That sequence is the whole point of the pre-solar roof page.
Flashing on install day should be a roofing detail. Ask who holds the C-39. “Our installers handle it” is not a license class.
Photograph the plane before rails go on. You will want that record if a later leak or reroof has to prove what was original.
Title 24, billing, and HOAs (not roof physics)
Title 24 Part 6 is the California Energy Commission energy standard. Read the current live text for photovoltaic rules on new dwellings and any listed exceptions. A reroof on a 1990s house is not automatically a new-home solar mandate. Confirm with the AHJ and the energy consultant. Do not treat Title 24 as a default.
Net Energy Metering rules for new interconnection changed in 2023 (NEM 3.0). Export credit is not the same as under earlier NEM. That is a CPUC and SDG&E billing issue. It does not decide whether an L-foot was flashed. Battery placement can change wall and garage work. It still does not replace roof flashing.
HOAs can write appearance rules. California’s Solar Rights Act lives at Civil Code section 714. Read the current live text. This page does not restate ban or stall holdings. Submit early. Carmel Valley HOA roof requirements is one planned-community example.
Coastal salt, inland UV, East County wind and WUI rules, and HOA packets all change the spec sheet. They do not change the flashing rule. WUI and Chapter 7A apply where the local map says they apply. Confirm with the fire AHJ.
Frequently asked questions
Does solar void my roof warranty?
It can, if penetrations skip the manufacturer’s approved method. Read the warranty. Ask the solar company who flashes the feet and whether that person is a C-39.
Should I replace the roof before solar?
If remaining covering and underlayment life is shorter than the array, yes. Pay for one sequence, not a reset later. We will not invent the two price tags. Get both written.
Can a roofer fix a leak with panels still on?
Sometimes, if the defect is outside the array. Leaks at the feet usually need modules moved. The solar contractor and the C-39 should say who detaches and who warrants the reopen.
Who is liable for a leak at a solar penetration?
In California, the contractor who performed the roofing portion of the work is the starting point. License class matters. Document who drilled. CSLB lookup is public.
Does Title 24 require solar on every reroof?
No. New dwellings and some major projects can trigger PV rules. A like-for-like reroof on an older house is a different permit. Confirm with the building department for that address.
Need a C-39 to look at an existing array or a roof that will take one? Call (760) 750-5557. We connect homeowners with licensed local roofers. We do not install the modules.