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Tile Roof Repair: Cracked Tiles, Underlayment Life, and Walking on Tile

  • Published November 7, 2026

Tile roof repairs come in two kinds: swapping cracked or slipped tiles, and lifting sound tiles to replace a leaking underlayment beneath them. Tiles crack when someone steps where they are unsupported, so a good repair starts by limiting who walks on the roof and where.

The second kind of repair surprises owners who believe tile cannot leak. Tiles shed water and shield the underlayment from sun, but water that gets past them at laps, edges and cracks runs down the underlayment. The underlayment is what keeps the house dry, and when it fails, a leak can appear under tiles that look perfect.

Why Tiles Crack Underfoot

Clay and concrete tiles are hard and stiff, and they handle weight pressing straight down well. What they handle badly is bending. A tile rests on battens, on the deck, or on the tile below it, and between those support points it spans open air. Weight placed where the tile is unsupported, such as the middle of a span or the crown of a curved tile, makes it bend, and a stiff material that bends cracks.

Not every crack shows at once. A hairline crack from one careless step can stay hidden until water works through it months later, which is why a tile roof that leaks after other work was done is worth inspecting near where people walked.

The practical rule is to limit foot traffic. Every trade that goes up, from satellite and solar installers to painters, chimney sweeps and gutter cleaners, adds risk. Before anyone climbs, ask how they will reach their work and whether they follow the tile installation manual. Your own checks belong on the ground with binoculars, as part of the tile routine in the seasonal checklist.

Replacing a Cracked or Slipped Tile

Swapping a single tile is the simpler job. The roofer lifts or wedges up the tiles that overlap the broken one, removes the broken pieces, frees or cuts the old fastener, slides in the replacement, fastens it the way the roof’s design requires, and lowers the overlapping tiles back into place. A slipped tile is handled the same way, because it has lost its attachment, whether a fastener, a nib or the batten it hung on, and needs new fastening, not a nudge.

How the replacement is fastened is not a matter of taste. The Tile Roofing Industry Alliance publishes its installation guides, including the Concrete and Clay Roof Tile Installation Manual (March 2024), which it says member companies recognize as their manufacturing installation guides, and the FRSA/TRI Florida High Wind manual, 7th edition, effective December 31, 2023, for Florida. Ask the roofer which manual they follow for your roof and your region.

Wind makes attachment more demanding. FEMA’s coastal construction series, in an archived index of the P-499 fact sheets, includes Fact Sheet 7.4, Tile Roofing for High-Wind Areas, from the 2010 edition of the series. In high-wind regions, a replacement tile has to be attached to the same standard as the tiles around it, because one loose tile can start a chain of failures in a storm.

While the broken tile is out, the roofer should look at the underlayment beneath it. A crack that has been letting water in may have left a wet or damaged spot that a new tile would cover up.

When the Leak Is Under the Tile: Lift and Re-Lay

When water comes in under tiles that are intact, swapping tiles does nothing. The fix is to lift the tiles, replace the underlayment, and lay the tiles back. Roofers call it a re-lay or a lift and re-lay. The underlayment under tile ages from heat and time, and the types of underlayment differ in what they are made of and how they hold up.

No single service life fits every tile roof, because it depends on the underlayment product, the roof’s heat exposure and how it was installed. To judge yours, find the underlayment named in the original contract or permit record, note the install year, and ask the roofer to photograph the underlayment wherever a tile is lifted for repair.

A re-lay runs in this order:

  1. Photograph and count the tiles in the work area, so the crew and you know how many must be reused.
  2. Remove the tiles section by section and stack them where they cannot slide or break. Set broken tiles aside.
  3. Remove the battens, if the roof has them, and the old underlayment, then inspect the deck and replace damaged sheathing.
  4. Install new underlayment to the tile manual and the local code, and renew flashing at walls, valleys and penetrations while the roof is open.
  5. Reinstall battens where the design uses them.
  6. Re-lay the tiles and fasten them to the manual’s requirements for your wind zone.
  7. Replace broken tiles with matching ones and check the finished area.

Some tiles break when they are lifted, even with careful handling, so line up replacement tiles before the work starts. A re-lay can cover one leaking section or the whole roof, and the choice depends on whether the underlayment is failing in one place or everywhere. Ask the building department whether a re-lay of your scope needs a permit.

Finding Replacement Tiles That Fit

Clay and concrete tiles are different materials with their own specifications. ASTM C1167 is the specification for clay roof tiles and covers three grades with differing resistance to weathering. ASTM C1492 is the specification for concrete roof tile. The two are not interchangeable in a repair: they differ in material, weight and surface, and a concrete tile in a clay roof, or the reverse, will look and weather differently. The differences between clay and concrete tile are covered on their own page.

Beyond material, a replacement has to match the profile (flat, S-shaped or barrel), the size, the way it laps or interlocks with its neighbors, and the color. A tile that does not interlock correctly leaves a gap, whatever its color.

Work through these sources in order:

  1. Spare tiles left from the original installation, which may be stored in a garage or side yard
  2. The manufacturer and profile name from the contract, invoice or permit record
  3. A supplier who can match a sample tile you bring in
  4. Salvage yards that stock used tile
  5. Tiles borrowed from a hidden area of the roof, replaced there with the closest new match

Historic tile adds rules on top of fit. If the house is historic or in a historic district, see repairing historic tile roofs before ordering anything.

Protecting a Broken Tile Roof Until the Repair

Temporary cover on tile is harder than on shingles. Someone has to walk on the tile to place it, the curved profile makes a tarp hard to seal, and nailing through tile to anchor it breaks more tile. A roofer who works on tile should place any cover, using weights or anchors that do not penetrate the tiles.

Disaster aid has a limit here too. The U.S. Army Corps of Engineers page on Operation Blue Roof, archived in April 2023, states that “contractors cannot cover roofs made of materials such as slate, asbestos or clay tile.” The program runs only when it is activated for a specific declared disaster, so confirm the terms for the event in question. For general guidance on temporary covers, see tarping a damaged roof.

Inside, catch the water, move what you can, and photograph the damage before cleanup.

Replace Tiles, Re-Lay the Underlayment, or Re-Roof?

Swap tiles when the problem is cracked or slipped tiles and the underlayment beneath them is dry. Re-lay when water comes in under sound tiles, either over one section or across the roof, depending on how far the underlayment has failed. Re-roof when breakage is widespread and no matching tile can be found, or when the deck is damaged across the roof. When the costs of those options are close, the cost-per-year comparison helps decide.

Ask the roofer which installation manual they follow, photograph cracked tiles from the ground, and keep every spare tile you have.

This guide is general information for U.S. homeowners, not legal, insurance, tax, or engineering advice. Codes, laws, and policy terms vary by location and change over time; confirm details with your local building department, your insurer, or a licensed professional.

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