Can Old Ridge Tiles Be Reused?

What makes a ridge tile fit to go back

The ridge is the line along the top of the roof where two slopes meet, and the ridge tiles are the curved or angled pieces that cap it. They sit on a bed of mortar, or on a dry-fix batten, and they take more weather than any other tile on the roof. A good tile rings when you tap it, has clean edges and keeps its glaze or colour. Those can be reused. The failure is nearly always the mortar bed under the tile, not the tile itself, so a ridge that has come loose often has perfectly good tiles on it.

The tiles we reject

We set aside any tile with a through-crack, however fine, because water gets into it and freezes. We also reject tiles with a face that is flaking or powdering (spalling), tiles with a broken socket or end, and clay tiles that have gone soft and porous with age. Concrete ridge tiles lose their surface colour over time, and the thin ones can snap when lifted. If we need to replace a few, we say so in the survey and show you the photos of each one.

Matching is the other limit. A new tile next to a weathered one will show for years, so we try to match the profile first and the colour second. Our page on ridge tile types covers half-round, angled and hogback shapes, which are not interchangeable.

How reuse works in practice

Each tile is lifted by hand, the old mortar is chipped off the underside and the ends, and the tile is checked. The ridge line is then cleared of crumbled bedding, the top courses are inspected, and the tiles are bedded back in fresh mortar. Current practice under BS 5534 is to fix ridge tiles mechanically as well, so the bedding is no longer the only thing holding them. If the roof is going to a dry-fix system instead, the tiles may need to match the clip and batten arrangement, which is worth knowing before you choose. Our guide to dry ridge against mortar-bedded ridge sets out that choice.

A cracked tile on its own is a different question. Our answer on whether a cracked ridge tile can be repaired explains when a single piece can be swapped without touching the rest.

What reuse saves, and what it does not

Ridge tiles are a small part of the cost of a re-bed. The labour of lifting, cleaning, rebuilding the bed and pointing the joints is where most of the time goes, and that is the same whether the tiles are old or new. So reuse is worth doing when it keeps a good-looking roof intact, not because it makes the job dramatically cheaper. Where a roof has already had patch repairs, with a mix of cement-grey mortar and tiles from different batches, we sometimes advise replacing the whole ridge, because the sound-looking tiles are of mixed age and will weather unevenly.

Hip tiles follow the same logic as ridge tiles, though they carry extra stress at the bottom end where they can slip. We check hip tiles on the same visit and explain what we find in the same photo report. Frost is the other thing to watch: an old clay tile that has soaked up water over many winters may look fine on top and be crumbling inside, and a tap test and a look at the underside catches most of those.

Before any tile goes back, we also look at the ridge timber or the batten underneath. A rotten ridge board or a sagging line will show through the finished ridge however good the tiles are, so a straight, sound base matters as much as the tiles themselves.

Why we show you before we decide

Reusing tiles saves money on materials and keeps the roof looking uniform, so we would rather do it wherever the tiles allow. We do not guess, though. The free survey includes photos of your own ridge, and the fixed written quote lists how many tiles we expect to replace. If more fail once they are in our hands, we tell you before anything is added. For the wider picture of ridge, hip and verge work, see our ridge, verge and dry-fix systems in Basingstoke page.