The short answer
Tiles slip when whatever holds them has failed. The usual suspects are corroded nails, rotten battens, frost working a tile loose, wind lifting an edge, or tiles that were never fixed properly in earlier work. One slipped tile after a gale is a small repair. Several from one slope point to a fault in the fixings or the timber beneath.
Three things hold a tile: its lug, a fixing and the timber behind. When any one gives up, the tile starts to move.
Nails, clips and the way tiles are held
Tiles hang from battens, the narrow laths fixed across the rafters. Each tile has a lug on its back that hooks over a batten, and many are nailed or clipped as well. Without a fixing, a tile relies on friction and its own weight, which will not hold on a slope in a gale.
Why do nails stop working?
Steel nails corrode in a damp roof until the shank thins and snaps or pulls through. Tiles laid with too few fixings, or nailed to a batten that has since split, slide when the wind gets under them. Marley states that installing to BS 5534, the standard method for slating and tiling, is not required by law, so older work may have been fixed more lightly than today's guidance expects.
Fixings come first on the checklist when a tile has moved. If the one that fell was part of a pattern, its neighbours probably share the same weakness. Our answer on whether roof tiles need clips goes into the fixings in more detail, and it helps explain what a roofer is looking for when they lift the nearest course.
Rotten battens and what lies under the tile
If the timber behind a tile is soft, no nail will hold it. Battens rot where water finds a way in, from a cracked tile, a failed valley or a gap in the underlay, the membrane that lies beneath them.
Could slipped tiles be a sign of rotten battens?
Yes, and it is a worrying one, because the trouble sits under many tiles at once. A roofer lifts a few tiles and presses the battens. Sound timber is firm. Rotten timber crumbles or lets a nail pull straight out. If the damage is local, the battens are renewed in that area. If it is widespread, stripping and re-battening the slope is the sensible repair.
Our guide on whether roof battens need replacing sets out the signs. A sagging line of tiles or a dip in the slope is a reason to look wider still, and our page on why a roof sags covers the structural side. Fixing a single tile onto a rotten batten only delays the next slip. The same goes for a batten that has split along the grain, where the nail has nothing left to bite into.
Frost, wind and tiles that were never fixed
Weather finishes what a weak fixing began. Wind across a roof lifts tile edges, and it bites hardest at the verge, the sloping edge above a gable end, and along the ridge. A tile with a rusty or missing nail cannot resist, and it slides or flies.
How does frost loosen a tile?
Water trapped in a joint or soaked into the tile freezes and expands, nudging the tile a little each winter. Over several seasons it works out of position, a little like a loose paving slab that rocks free after repeated frosts. A face weakened by frost may also crack and drop, which our page on spalling roof tiles explains.
Then there is older work. Some tiles were put up without nails or clips because the roofer trusted the lug alone, or because a gap was patched in a hurry and left loose. Unfixed tiles can sit still for years until the right wind arrives. A roofer finds them by lifting a tile edge gently and feeling how much it moves, which is a test that cannot be done from the ground.
Next steps once a tile has moved
Resist the urge to climb up and push it back, however simple it looks from the garden. Tiles break underfoot, and the real cause of the slip usually lies below the surface. A repair that ignores the cause tends to come undone in the next strong wind. From the ground, photograph the gap, note which slope it came from and check the loft for damp.
Does a slipped tile need attention straight away?
It is worth dealing with soon. Rain reaches the underlay and battens through the gap, and neighbouring tiles lose their cover. Where water is already marking a ceiling, a temporary sheet fixed from a ladder holds things until the repair can be done properly.
For a handful of tiles, MyJobQuote gives £150 to £200 for five as a typical UK range (Oct 2026). Access affects cost, because we use proper equipment instead of walking on the tiles. The pitched roofing page lists our work. We look first, and one written total follows the survey. If the survey finds batten rot or missing fixings, those repairs are folded into the same total, so there is no second price to chase.
More on slipped tiles
Will a slipped tile settle back on its own?
No. A tile that has moved has lost its hold, and the gap it leaves lets water reach the underlay. It may sit still in calm weather, but the next gust can send it down. Putting it back correctly means checking the batten and fixing it, not just pushing it into place.
Do tiles slip more on a steep roof?
Gravity pulls harder on a steep slope, but pitch alone is not the cause. A properly fixed tile holds at any pitch its maker allows. What matters is the fixing, the batten behind it and exposure to wind. The maker's published minimum pitch for your tile is the figure to check.
The full picture: Pitched roofing in Taunton · More short answers