The tile is not the roof
This is the part most homeowners have never been told, and it explains almost everything else about tile repair. The tile is not what keeps water out of your house. The tile is a shield. It takes the UV, the hail and the direct impact of rain, and it sheds most of the water downslope. What actually waterproofs the roof is the underlayment stapled or adhered to the deck beneath it.
Concrete and clay tile are close to indifferent to Florida weather. Stone does not dry out, chalk or lose volatiles the way asphalt does. So the covering outlives the waterproofing underneath it by a wide margin, and the roof reaches a point where every tile on it is sound and the roof still leaks.
That is why a tile roof gives you so little warning from the ground. A shingle roof tells on itself — granules in the gutter, curled edges, flat patches where the texture has gone. A tile roof looks the same the day it was installed as it does the day the underlayment gives up. The first sign is usually a stain on a ceiling.
It also means that when somebody says a tile roof lasts a very long time, they are talking about the tile. They are not talking about the system, and the system is what you own.
The tile sheds the water. The underlayment keeps it out of the house. Those are two different parts with two very different working lives.
How the underlayment dies
Heat is the main thing. Under a tile roof in Florida the space between the tile and the deck runs hot, day after day, year round. Organic felt underlayment bakes. It loses its oils, goes brittle, and then cracks — usually first at the fastener penetrations, because that is where it is already perforated and under tension.
Movement finishes it. Tile is heavy and it shifts slightly with thermal cycling and wind. Every shift works the underlayment against the staples and nails holding it down, and brittle material tears rather than flexing. By the time it is failing you have a sheet with thousands of small holes in it, each one sitting under a path that water uses.
Water-driven failure comes next. Wind-driven rain gets under tile routinely — that is normal and expected, which is exactly why there is a waterproof layer down there. Once that layer is cracked, the water that was always getting under the tile now has somewhere to go. It finds the deck, and in this humidity the deck stays damp long enough between storms for rot to make progress.
The valleys and the flashing go on their own schedule. Valley metal under tile corrodes and the underlayment turnups at walls and chimneys are the most heat-stressed, most movement-stressed parts of the whole roof. On most of the tile roofs we open, those are worse than the field.
Cracked and slipped tiles, and what they do and do not mean
Tiles crack. Dropped branches, foot traffic, hail, and manufacturing stress all do it. A cracked tile is not immediately a leak, because the underlayment is still there and still doing its job. What a cracked tile does is expose the underlayment to direct UV and direct water impact in that one spot, so that spot ages far faster than the rest.
Slipped tiles are a different signal. A tile moves because its fastener failed, the mortar at the ridge or hip let go, or the batten it was hanging on rotted. A slipped tile both exposes the underlayment and tells you something about the fastening system, so it is worth more attention than a cracked one.
Both are genuinely repairable, and that repair is worth doing promptly. Replacing broken tile and resetting slipped tile is routine work. The question that decides whether it is worth doing is the condition of the underlayment underneath — if that is already gone, you are replacing tile over a sheet that is going to leak anyway.
So a tile repair is really two questions, not one. What is broken up there, and what state is the waterproofing in. Nobody can answer the second one from the street, and the honest version involves lifting tile in a few places and looking.
Why walking a tile roof turns one repair into three
Concrete and clay tile are brittle in the middle of the span and strong over the battens and the headlap. Someone who knows tile steps on the lower third of the tile, where it is supported, and walks the courses deliberately. Someone who does not know tile walks it like a shingle roof and breaks tiles behind themselves the whole way.
This is not a small effect. On an older roof with tile that has already been through decades of UV and thermal cycling, a crew that walks it carelessly can crack more tile getting to a repair than the repair itself involved. We have followed other people's repairs where the leak was fixed and there were six new cracked tiles in the access path.
It is also why the number of people who have been on your roof matters. Satellite installers, air conditioning technicians, gutter cleaners, pressure washers and solar crews all walk tile, and most of them have no training in it. A tile roof with a lot of trade traffic over the years has usually accumulated damage in a line from the access point to the equipment.
The practical consequence for you is twofold. Keep people off it who do not need to be up there, and when work has to happen, ask directly how the crew walks tile and whether broken tile in the access path is included in their scope or billed as an extra. The second question gets honest answers quickly.
A crew that walks tile like a shingle roof can break more tile getting to the repair than the repair was about in the first place.
Repair, relay or replace
A repair is the right answer when the underlayment is broadly sound and the problem is local — a cracked field tile, a slipped course, a failed boot, a section of valley, a wall flashing that has come loose. The tile comes off that area, the underlayment and the detail get rebuilt, and the tile goes back. This is most of the tile work we do, and it is appropriate far more often than people expect.
A relay — sometimes called a tile re-lay or re-underlayment — is the answer when the tile is in good condition and the underlayment is finished. The existing tile comes off and gets stacked on the roof or on the ground, the old underlayment comes up, the deck gets inspected and repaired, new underlayment goes down, and the same tile goes back on. You are buying new waterproofing and reusing the covering. It is a large job because every tile is handled twice, and there is always breakage, so some new tile gets bought to make up the difference.
A full replacement is for when the tile itself is no longer serviceable, when too much of it is cracked or spalling to be worth salvaging, when the deck has failed broadly, or when you want a different system. It is also sometimes the answer when the tile is a discontinued profile and there is not enough sound stock on the roof to come back with.
The decision between relay and replacement is largely about the tile, and it is made on the roof by looking at how much of it survives handling. A roof with brittle, delaminating tile loses a large share of it just coming off, and at some point you are buying most of a new roof's worth of tile anyway and paying to handle the old tile twice for nothing.
What to ask, and what we will not tell you
Ask whether anyone has actually lifted tile to look at the underlayment, and where. A proposal for a tile roof written without that is a guess about the only thing that matters.
Ask what underlayment is going down on a repair or a relay, by product. Under tile in Florida the choice between a basic felt, a high-temperature synthetic and a self-adhered membrane is a real difference in how the next decades go, and it is the cheapest place for a contractor to save money without you noticing.
Ask whether broken tile in the access path is in the scope or billed separately, and ask what happens about matching tile if yours is a discontinued profile. If sound tile has to be salvaged from elsewhere on the roof to patch a visible slope, you want to know that now.
Ask who pulls the permit and under whose license. Ours is a Florida Certified Roofing Contractor license, CCC1333347, and you can look it up before you call us.
And on the insurance side, we will be plain about the limits. We document what we find with photographs and give you the condition and the scope in writing. We do not perform or sign wind mitigation or four-point inspections — a roofing license does not qualify under Florida Statute 627.711(2). What your carrier decides about a tile roof is between you and them, and we will not predict it.