Solar Panels on Clay Tile Roofs: What SoCal Homeowners Should Know
Yes — solar goes on clay and concrete tile, but the rules are stricter than on shingle. The tile industry’s own guidance prohibits attaching anything directly to a tile and calls for two flashings at every penetration: one at the deck and one at the tile. Because tile sheds water onto the underlayment beneath it, that membrane — not the tile — usually decides whether the roof is ready. And tile is heavy: California’s solar permitting guidebook assumes 20 psf for a tile roof, twice what it assumes for shingle.
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- Mounts go into the rafters, never onto the tile. The Tile Roofing Industry Alliance prohibits attaching any accessory directly to a tile and asks for a deck flashing and a tile flashing wherever a mount penetrates.
- There are three common ways to mount: tile hooks, tile-replacement flashings, or taking the tile off under the array and mounting on shingle (a comp-out).
- The underlayment is the waterproofing. On an older roof, have it checked before the panels go on — replacing it later means taking the array off.
- Some tile can break on any install; what matters is the plan to replace it. Many older Monier, Lifetile and Boral concrete tile profiles are no longer made in North America.
- Tile roughly doubles the roof weight the state assumes, so the rafter check is tighter. A roof that fails the state’s simple structural checklist needs an engineer’s calculations.
How solar attaches to a tile roof
Every method has the same two jobs: land the attachment in a rafter, and keep water moving over the tile with a second line of defense on the deck below. Tile is not a mounting surface — it is brittle, and it is not what keeps the house dry.
| Method | How it works | What keeps water out | Trade-offs |
|---|---|---|---|
| Tile hook | A base is fastened into the rafter on the roof deck; a formed arm reaches out between tiles and carries the rail above the tile. The tile goes back over it, notched if needed so it sits flat. | Sealant in the pilot holes and a deck-level flashing under the base. The tile industry also asks for a tile flashing. | The tile stays, but every mount means lifting and resetting tile. |
| Tile-replacement flashing | One tile per mount is taken out and a shaped metal flashing takes its place, with the attachment coming up through it. | The flashing becomes part of the water path, lapped like the tile it replaces. | No grinding or cutting of tile; the flashing has to match the profile (flat, S or W). |
| Comp-out (tile off under the array) | Tile is removed inside the array footprint, new underlayment and composition shingle go down there, and the array mounts on shingle. The original tile goes back around it. | Ordinary flashed shingle attachments. | Adds a roofing scope, and the layout must be final before the roofer starts. |
Sources: IronRidge All Tile Hook manual · IronRidge tile replacement flashings · TRI Alliance brief on flashings at tile penetrations. Examples from our Los Angeles work: hooks on flat concrete tile in Northridge; comp-outs in Reseda and Chatsworth.
Nothing attached to the tile, and two flashings at every penetration
The Tile Roofing Industry Alliance (TRI), whose installation manual is generally considered the minimum standard for concrete and clay tile, addresses solar directly: “The attachment of any accessory directly to an individual tile or tiles is prohibited.” Anything fastened to or through the roof sheathing that alters the underlayment or the tile counts as a penetration, and every penetration needs an approved deck/underlayment flashing and a tile flashing — so water stays on the tile surface, with protection at the deck if the tile or its flashing is breached. Hardware instructions can stop at the deck: IronRidge’s tile-hook manual calls for sealant in the pilot holes and a deck flashing, then notching the tile to fit. Ask which standard your installer follows and how each penetration is flashed. A bead of sealant on the face of a tile is not a flashing (TRI brief, TRI solar brief).
The underlayment decides whether the roof is ready
A tile roof is a water-shedding assembly. The tile carries most of the rain off, but the membrane beneath it is what keeps water out of the house. TRI’s manual says most problems on tile roofs come from water that gets past improper flashing or from wind-driven rain, and that this is why the underlayment is critical to the whole system (TRI installation manual).
Tile is durable; the membrane under it is the part that wears out. On an older roof, lift a few tiles where the array will go before you sign, and look at the underlayment. If it is brittle or torn, replace it before the panels go on — doing it later means removing and reinstalling the array. When the tile itself is sound, the usual fix is to lift it, lay new underlayment and flashings, and set the same tile back, as on this Canoga Park reset and this Arcadia reroof.
Two cautions. In some jurisdictions, replacing more than a set share of a roof requires bringing the whole roof up to current code (TRI). And California’s cool-roof rule can apply to reroofing; the code side is covered in should you replace your roof before solar?
Broken tile, walking on tile, and tile that is no longer made
Crews have to walk on and lift tile, and some of it can break. TRI recommends stepping on the bottom 3 inches of an installed tile, where it rests on the tile below, and on high-profile S tile putting heel and toe on the high points of adjacent tiles. It also notes that most tile manufacturers do not warrant breakage from foot traffic, and that a broken tile should be replaced promptly, before water or sunlight reaches the underlayment (TRI walkability brief).
The harder question is what a broken tile gets replaced with. TRI’s April 2026 bulletin lists discontinued tile, including many older Monier, Lifetile and Boral concrete profiles; for Monier tile, it says only salvage or replication is left. Current profiles generally do not interlock with discontinued ones, and many codes do not allow partial repairs with mismatched, non-interlocking tile (TRI bulletin 2026-04). So before the install, identify your tile and agree on the plan: spares from a salvage yard, tile harvested from a less visible slope, or tile removed from under the array in a comp-out.
Tile is heavy: the structural check
State law requires cities and counties to model their expedited solar permits on the California Solar Permitting Guidebook, though they may adjust it for local conditions (Government Code §65850.5). The guidebook’s structural checklist for flush-mounted arrays asks, among other things, whether the panels and racking weigh no more than 4 psf, whether there is a 2- to 10-inch gap between the modules and the roof surface, whether the array covers no more than half the roof, and whether the anchors are spaced within its table. If any answer is no, the permit needs calculations stamped by a California-licensed civil or structural engineer.
Tile matters in the guidebook’s optional rafter-span check, which some building departments add. It assumes a tile roof weighs 20 psf against 10 psf for shingle, so the allowable spans are shorter: a post-1960 2x6 rafter at 24 inches on center may span 11′-9″ under shingle but 10′-2″ under tile (California Solar Permitting Guidebook, Table 2).
What tile adds to the cost
Tile costs more to mount on than shingle, for reasons you can see in a quote: every attachment means lifting and resetting tile; tile hooks and replacement flashings cost more than shingle mounts; broken tile has to be replaced, sometimes from salvage; and a comp-out or underlayment job is roofing work priced on its own. No public source tracks a tile adder for Los Angeles, so ask for it as separate lines rather than folded into a price per watt: the mounting method and count, the flashing at each penetration, the spare-tile plan, and any roofing scope. For the base system price, see solar panel cost in Los Angeles.
Before you sign: a tile-roof checklist
| What to check | Why it matters | Red flag |
|---|---|---|
| Mounting method and hardware named | Shows whether each mount lands in a rafter and suits your tile profile | “Standard mounts,” or a base fastened on top of the tile |
| Flashing at every penetration | The tile industry calls for a deck/underlayment flashing and a tile flashing | Sealant on the tile face as the only seal |
| Underlayment checked | It is the waterproofing, and it wears out before the tile | No one lifted a tile before quoting |
| Spare-tile plan | Some tile breaks, and discontinued profiles need salvage or harvested tile | “We’ll seal any cracked ones” |
| Structural check | Tile doubles the roof weight the state’s span table assumes | No rafter review on an older roof |
| Roof covered by the workmanship warranty | A leak at a mount is a roofing problem, not an equipment one | Warranty covers panels and inverters only |
| License | A C‑46 solar contractor may do the construction work required to install solar (CSLB); what matters is who answers for the roof | No written coverage for the roof penetrations |
One contractor for the roof and the array
On tile, the roof and the array are one job. Cali Energy holds California C‑39 roofing and C‑10 electrical classifications (CSLB #1032379), so the same crew answers for the attachments, the flashing and any underlayment work. Send photos of the roof and a close-up of the tile, and we’ll tell you which mounting method fits and whether the underlayment needs work first.
Get a tile-roof solar estimateFrequently asked
Can you put solar panels on a clay tile roof?
Yes. The attachments go into the rafters through tile hooks, tile-replacement flashings, or a comp-out, where the tile under the array is replaced with shingle. What the tile industry rules out is attaching anything directly to a tile: TRI Alliance prohibits it and asks for a deck/underlayment flashing and a tile flashing at every penetration.
Do solar panels crack tile roofs?
Some tile can break during an install, because crews have to walk on and lift it. TRI recommends stepping only on the bottom 3 inches of a tile and notes that most manufacturers do not warrant breakage from foot traffic. Broken tile should be replaced promptly, before water or sunlight reaches the underlayment, so agree on a spare-tile plan before work starts.
What if my roof tile is no longer made?
It happens on older roofs: TRI’s April 2026 bulletin lists many discontinued profiles, including older Monier, Lifetile and Boral concrete tile. Current profiles generally do not interlock with discontinued ones, and many codes do not allow mismatched partial repairs. The options are salvage tile, tile harvested from a less visible slope, or tile freed up by a comp-out under the array.
Should I replace the underlayment before installing solar on my tile roof?
If it is worn, yes — before the panels go on, because replacing it later means removing and reinstalling the array. The underlayment, not the tile, is what keeps water out. When the tile is sound, the usual fix is to lift it, lay new underlayment and flashings, and set the same tile back. See should you replace your roof before solar?
Can my tile roof hold the weight of solar panels?
It has to be checked more closely than shingle. California’s Solar Permitting Guidebook, which cities must model their expedited permits on, assumes a tile roof weighs 20 psf against 10 psf for shingle, so its optional rafter-span table is shorter for tile. Its simplified checklist also caps panels plus racking at 4 psf; if the roof fails any check, the permit needs calculations stamped by a California-licensed civil or structural engineer.
Is solar more expensive to install on tile than on shingle?
Yes, somewhat. Each attachment means lifting and resetting tile, tile hooks and replacement flashings cost more than shingle mounts, broken tile has to be replaced, and a comp-out or underlayment job is roofing work priced separately. No public source tracks a Los Angeles tile adder, so ask for those items as separate lines in the quote.
How do I know a tile solar install was done watertight?
Ask the installer to name the mounting method and hardware, and to show how each penetration is flashed at the deck and at the tile. A base fastened on top of the tile, or sealant on the tile face as the only seal, falls short of the tile industry’s standard. Get the roof penetrations covered in the written workmanship warranty, not just the equipment.
Related reading
Sources & methodology
Figures on this page come from the primary sources below and, where noted, from Cali Energy calculations using the stated assumptions. Rates, incentives, and program terms change; each was verified September 28, 2026.
- TRI Alliance — Concrete and Clay Roof Tile Installation Manual (2024 edition, revised 5/2025)
- TRI Alliance — Technical Brief: Recommendations of Flashings at Tile Penetrations (June 2016)
- TRI Alliance — Technical Brief #2008-01: Solar Systems
- TRI Alliance — Technical Brief #2014-02: Walkability on Concrete and Clay Roof Tiles
- TRI Alliance — Technical Bulletin 2026-04: Discontinued Roofing Tiles in North America
- TRI Alliance — Technical Brief #2021-02: Tile Replacement Considerations
- California Solar Permitting Guidebook, 4th edition (Governor’s Office of Planning and Research) — structural criteria and Table 2
- California Government Code §65850.5 — expedited permitting for small residential rooftop solar
- IronRidge — All Tile Hook installation manual
- IronRidge — tile replacement flashings
- CSLB — C-46 Solar Contractor classification
Solar on a tile roof, done watertight
On tile, the roof and the array are one job. Send photos of the roof and a close-up of the tile, and we'll tell you which mounting method fits and whether the underlayment needs work first. Cali Energy holds C-39 roofing and C-10 electrical licenses.
Get a free estimatePrepared by Cali Energy, September 28, 2026. This article is for general educational purposes only and is not legal, tax, financial, engineering, or utility advice. Rates, incentives, codes, permit requirements, equipment specifications, prices, and program terms may change; figures and timelines are estimates, not guarantees. Confirm current requirements with the applicable utility, AHJ, program administrator, manufacturer, or a licensed professional. See our Content Disclaimer. Cali Energy · 19201 Parthenia St, Unit E, Northridge, CA 91324 · CSLB #1032379 (B, C-10, C-39)