Cracked Roof Tile: Repair or Replace?

Roof tiles swell and shrink through the day, freeze and thaw through winter, and flex under wind. A crack is a line where the tile shifts a little with each of these. Mastic or bitumen spread along it must stretch with that movement, and on a weathered surface it usually peels away instead. Water then slips behind it and sits there, which can leave things worse than before.

Sealant does have a place as an emergency measure. If a tile splits in a storm and more rain is due, a temporary patch limits the damage until a roofer can attend. Think of it as a plaster, not a cure. The tile is still broken, and the roof sheds water because tiles overlap, not because each surface is a perfect barrier.

A crack through the middle of a tile is not the same as a missing corner or a broken head. A clean break near the top may leave the tile hanging by one nail. In each case the advice is the same, and the proper repair is described below.

The roofer works from a ladder, roof ladder or tower, depending on height, and props up the courses overlapping the damaged tile with small wedges. The cracked tile comes out, in pieces if need be. The batten beneath is checked for rot and the underlay for tears. A replacement of the same profile is hooked over the batten and secured with a nail or clip, and the propped tiles are lowered back into place.

A good roofer inspects the neighbours too. Frost damage often runs in groups, and a tile that looks sound from the ground may carry a hairline fault in the same row. Tiles that split when touched hint that the whole patch is brittle, which our answer on broken tile nibs explains for older concrete tiles.

If the underlay is torn where the tile sat, patching the tile alone will not cure a leak, so the repair extends to the underlay. Our page on torn roof underlay shows what that involves.

Leave the climbing to the professionals. Tiles are slippery, brittle and a long way from the ground.

One cracked tile after a falling branch or a knocked ladder is simply an accident. The useful question is what caused the crack. A tile that split in a hard frost has been holding water, and its neighbours have lived through the same weather. Cracks beside the nibs, across many tiles in one area, or in a line along a batten can mean the timber beneath has moved or the roof has been walked on.

Moss is another clue. A thick carpet keeps moisture against the tile, which then freezes and flakes the surface. Cleaning helps, but it does not mend a split tile, so the order is repair first and clean second.

Look at the ceilings as well. A brown stain or damp patch beneath a cracked tile means water has already got in, so the underlay and timbers need checking. The photos from our survey show the tile, the batten and the underlay, so you can see what the fault is and whether we recommend a patch or a bigger job. Cracks scattered across a slope can point towards re-covering, and we explain the reasoning if so.

As a national yardstick, Checkatrade's October 2026 tile replacement table gives £170 to £500 for a repair of five tiles or fewer. A simple job sits at the bottom, about £225 covers ladder work and bedding, and the top end is where scaffold comes in. The table excludes VAT, so check whether a quote you receive adds it.

Access moves the number more than the tile does. On a low roof with an open run for the ladder, a tile is cheap to reach. One mid-slope on a two-storey house, over a conservatory or beside a chimney will probably want a tower or scaffold, and the highway authority has to license any scaffold that obstructs the pavement or road. The licence is sorted out between us and the scaffolder; Kent County Council's page expects the scaffolding company to apply.

One price, in writing, follows the survey. To start, send a clear shot of the slope, mark where the crack is and say whether anything shows on a ceiling. Our answer on replacing individual roof tiles covers the method and the matching, and our pitched roofing page takes in larger repairs.