Are Loose Ridge Tiles Dangerous?

Along the crest of a pitched roof runs the ridge, at the point the slopes meet, and the ridge tiles are the curved or angled pieces that cap it. Traditionally they are bedded in mortar. When that mortar cracks, crumbles or lets go, a tile can rock, shift along the line or slide down the slope. Even a tile that looks settled from the garden may be held by little more than its own weight.

A concrete or clay ridge tile falls a long way and lands hard. The danger is greatest in strong wind, when gusts get under a loosened tile, and after a frost, when water in the cracks has expanded and pushed the bed apart. If the tile comes down on a conservatory roof, a patio table or a parked car, the harm is not limited to the roof, and a person underneath could be badly hurt. Loose tiles also let rain in beneath the ridge, so the roof timbers and loft insulation can get wet before any stain shows on the ceiling below, and that quiet damage costs more than the tile.

Stay on the ground. A roof is a fall from height, ridge tiles break underfoot and a ladder at the eaves does not make the ridge safe to reach. Look with binoculars from the garden or street for tiles that sit crooked, gaps where mortar has fallen away, or fragments on the ground below. Photograph what you see, because a roofer can use the images to plan the job and an insurer may ask for them.

Keep children, pets and cars away from the affected side, and do not use the path or patio beneath it until it has been checked. If a tile has already fallen, pick up the pieces with gloves and keep them, since a roofer can match the profile from them. Where the damage follows a storm, let your insurer know before anything is repaired, and hold on to the pictures and the receipts for any temporary fix. A leaking or unsafe roof can be made safe first and surveyed after. Our answer on a ridge tile blown off covers the wind case in more detail.

The traditional repair is to lift the loose ridge tiles, clear out the crumbled mortar and set the tiles again on a fresh bed. Done well, it leaves a neat, even finish along the crest, and the roof looks the way it did when it was new. The mortar should not be left to carry the tiles alone, though. The current slating and tiling standard, BS 5534, expects mechanical fixings on bedded ridge tiles, so a good re-bed includes stainless steel clips or screws as well as the mortar.

Re-bedding suits a ridge that is otherwise sound and a roof where the owner prefers the traditional look. It does mean the mortar will weather again in time, and the cycle of cracking can start over. Ask the roofer to show you the old bed once it is lifted, with photos, so you can see why it failed. Our answer on cracked ridge mortar explains the usual causes and the signs worth checking once the work is done.

A dry ridge swaps the mortar for a mechanical system. The tiles are held by a batten, fixings and a ventilated or sealed strip beneath them, so there is no bed to crack or fall out. BS 8612 is the test specification that dry ridge, hip and verge kits are tested against. A dry ridge is quicker to fit than a bedded one and avoids the repeated cracking cycle, so it suits a roof where the same ridge has been patched before. Its fittings also make a neat line, with clips hidden under the tiles where nobody will see them.

The old mortar has to be removed and the ridge line checked for sound timber first. As a national guide, Checkatrade's June 2026 repair table gives £50 to £70 per metre for dry ridge repairs, and what you pay depends on the length, the height and the reach needed, plus whatever is found under the old bed once it is off. Our comparison of dry ridge and mortar sets the options side by side, and the dry ridge and dry verge page covers the system overall. Send photos of the ridge and the nearest tiles, and the survey will lead to one total price in writing.