Why Is My Tile Roof Leaking?
Citium Roofing Solutions · · Updated
The tile is the armor. The layer underneath is the roof. When a tile roof leaks, look under the armor.
Drive through Glendale, Burbank or Alhambra and you'll see clay and concrete tile roofs that look fine from the street. Some of them leak anyway. Tile doesn't waterproof a house on its own. It sheds most of the weather onto an underlayment and a set of metal flashings, and those don't last as long as the tile.
So the first question for any tile roof leak is where the water gets past the tile, and the fix usually starts underneath it. Below are the eight causes to check, what the stain's location tells you, and what to do before a roofer arrives.
The short answer
A tile roof leaks when water gets past the tile and then past the layer beneath it. That happens where the underlayment has worn out, where flashing at walls, chimneys, valleys or pipes has failed, or where a penetration was never flashed at the deck. Cracked and slipped tiles speed it up by letting more water and sun reach the underlayment. Finding the cause means lifting tile at the leak and looking.
8 reasons tile roofs leak
1. The underlayment has worn out
Water gets past tile at every lap and gap, especially in wind-driven rain. The underlayment on the deck carries it off the roof. The Tile Roofing Industry Alliance calls this layer the secondary protection in case the tile or tile flashing is breached [1]. When it turns brittle, cracks at the laps or tears around fasteners, water that used to run down it reaches the deck. Paper has a birthday, and tile hides it.
2. Cracked or broken tiles
A crack or a missing corner lets more water reach the underlayment and exposes it to daily sun. The industry standard says cracked or broken tiles must not be installed or allowed to remain on the roof [1]. Tiles crack from foot traffic, falling branches, wind-thrown debris and old, brittle material.
3. Slipped or displaced tiles
Tiles slide when fasteners corrode or break, when battens give way, or after someone lifts them and doesn't reset them. A slipped tile opens a gap in the course and often shows as a row of tiles sitting lower than its neighbors.
4. Clogged valleys
Valleys carry water from two slopes. Leaves, needles and broken tile pile up in them, dam the flow, and push water sideways under the tile and over the edge of the valley metal. The tile industry's installation manual includes alternate flashing details for spots where debris can accumulate [2]. If the stain shows up under a valley early in the rainy season, start there.
5. Failed flashing at walls, chimneys and skylights
Wherever a tile roof meets a wall, a chimney or a skylight, metal flashing turns the water. Rusted pans, flashing sealed with roofing cement instead of formed metal, and cracked stucco behind counterflashing all let water in. When tile is reinstalled, California's residential code requires rusted, damaged or deteriorated flashing to be replaced [3].
6. Pipes, vents and solar mounts
Every hole through a tile roof needs two layers of protection: flashing at the deck and underlayment, and flashing at the tile surface. The Tile Roofing Industry Alliance singles out solar installations, noting confusion about what flashing tile roofs need, and says every penetration requires both [1]. A mount sealed only at the tile, or a vent pipe whose deck flashing cracked years ago, leaks under intact tile.
7. Damage from foot traffic
The Tile Roofing Industry Alliance says walking on tile should be avoided, and that most manufacturers don't warrant breakage from foot traffic [2] [1]. If a painter, solar crew, satellite installer or HVAC tech has been on your roof, look for a path of cracked tiles between their ladder and where they worked. Some of those cracks can't be seen from the ground.
8. Tile on a slope that's too low
Tile needs pitch to shed water. The installation manual treats tile on slopes under 3:12 as decorative, meaning the membrane underneath does all the waterproofing [2]. Porch roofs, additions and patio covers sometimes carry tile on a low pitch over an underlayment that was never meant to handle that much water. Those sections are worth checking first.
When it isn't the roof
Some stains on a top-floor ceiling start somewhere else: a cracked plumbing vent pipe in the attic, condensation from an HVAC line, a leaking window, or a crack in the stucco above. If a stain appears on dry days, or only when sprinklers run or the air conditioning is on, the roof may not be the source.
What the stain's location tells you
| Where you see water | Where to look on the roof |
|---|---|
| Below a valley | Debris in the valley, worn valley metal, or underlayment along the valley |
| Next to a chimney or exterior wall | Wall or chimney flashing, counterflashing, cracked stucco above |
| Around a skylight | Skylight flashing, or the skylight itself |
| Near a bathroom or kitchen | Flashing at a plumbing vent pipe |
| Where the ceiling meets an exterior wall | Underlayment at the eave, overflowing gutters, a low-slope edge |
| Under a solar array | Deck-level flashing at the mounts |
| Several places at once | Underlayment wearing out across the roof |
Water travels along the deck and rafters before it drips, so a stain can sit several feet downhill from the source. Treat the table as a starting point, not a diagnosis.
What to do right now
- Stay off the roof. Tile breaks underfoot and is slippery, especially when wet.
- Catch the water and move belongings. If a ceiling is sagging with water, keep people away from it.
- Photograph the stain, the ceiling and the roof from the ground, with dates.
- Check the attic if you can reach it safely, and note where the water comes through.
- Call a roofer to find the cause. If water is still coming in, ask about temporary protection until the permanent repair.
- If a storm or a falling branch caused it, contact your insurer. The California Department of Insurance says a policy may not cover further damage if you didn't take reasonable steps to protect the property [4].
Don't let it sit. The Department also notes that moisture from leaks can lead to mold [4].
How a tile roof leak gets fixed
A proper repair follows the water. The roofer lifts tile at and above the leak, checks the underlayment and flashing, and replaces what has failed. The tile industry's manual describes replacing a broken tile as removing the pieces and fasteners and repairing the underlayment before the new tile goes in [2]. What happens next depends on what's under the tile.
A repair is enough when
- Damage is clustered: a path to the HVAC unit, a corner the tree hits, one valley
- The underlayment comes up pliable where tiles are lifted
- Replacement tiles can be matched or blended
- Flashing at walls and chimneys can be rebuilt without stripping the roof
Lift and relay or new tile makes sense when
- The underlayment tears like old paper wherever tiles come up
- There are wet, rusted nails or stained decking in several areas
- Leaks keep coming back in different places after spot repairs
- A buyer's inspector has already flagged the system
On a lift and relay, the sound tile is stacked, the underlayment and flashing are replaced, and the tile goes back on. California's residential code allows reinstalling existing clay or cement tile, as long as damaged, cracked or broken pieces are left out [3]. Tile roof repair in Glendale compares the three options side by side, and how long a tile roof lasts explains why the underlayment usually sets the timeline.
Does homeowners insurance cover a tile roof leak?
It depends on the cause. The California Department of Insurance lists windstorm and sudden, accidental water damage as generally covered, and water damage from seepage or leaks, wear and tear, and neglect as generally not covered [5]. Tiles broken by a falling branch in a storm may be a claim. Underlayment that wore out with age usually isn't. Your policy language decides.
Questions
Why is my tile roof leaking when no tiles are broken?
Because the tile isn't the waterproof layer. Water gets past tile at laps and gaps, and the underlayment and flashing underneath carry it away. When they wear out, or fail at a wall, valley or pipe, the roof leaks under intact tile.
Can I fix a tile roof leak myself?
It isn't a good idea. Walking on tile breaks it, the roof is slippery, and the cause is usually under the tile where you can't see it without lifting tiles correctly. Catch the water, take photos and call a roofer.
Will replacing the cracked tile stop the leak?
Only if the crack was the whole problem. Replacing a broken tile should include repairing the underlayment beneath it. If the underlayment has failed across the roof, new tile on top won't stop the leak.
Why does my tile roof leak only in heavy rain?
Heavy or wind-driven rain pushes more water past the tile and fills valleys faster. A worn spot in the underlayment or a partly clogged valley may cope with light rain and fail in a downpour.
Does a leaking tile roof need to be replaced?
Not necessarily. Many tile leaks are local repairs. If the underlayment has failed across the roof but the tile is sound, a lift and relay can reuse the tile. New tile makes sense when the tile itself is widely damaged or can't be matched.
Does insurance cover tile roof leaks?
Sudden damage from a covered peril, such as a windstorm or a falling branch, may be covered. Leaks from wear and tear or long-term seepage generally aren't. Check your policy and talk to your agent.
Have the leak traced, not guessed
A Citium assessment of a leaking tile roof considers the underlayment condition, broken pieces and leak paths, and the repair is set out in a written scope. Call 818-531-1277, email citiuminc@gmail.com, or request an estimate online. Citium Roofing Solutions is at 401 N Brand Blvd, Unit L106B, Glendale, CA 91203.
Get a free estimate Call 818-531-1277 Request a roof assessment
Sources
- Tile Roofing Industry Alliance, Technical Briefs. Checked September 28, 2026.
- Tile Roofing Industry Alliance, Concrete and Clay Roof Tile Installation Manual (March 2024, revised 5/2025). Checked September 28, 2026.
- GoCodebook code library, California Residential Code (Title 24, Part 2.5), Section R908 Reroofing. Checked September 28, 2026.
- California Department of Insurance, Residential Property Claims Guide. Checked September 28, 2026.
- California Department of Insurance, Homeowners and Renters Insurance guide (perils generally covered and not covered). Checked September 28, 2026.