Can Dry Ridge Go on Plain Clay Tiles?

Plain tiles are small, thin and laid in many overlapping rows, which gives the roof its familiar rippled look. At the top, the last courses stop short of the apex and the ridge tiles cap the gap. A dry ridge changes how those caps are held, not how the roof is laid. The ridge tiles still run along the top, but they are fixed to a batten through clips or screws and a seal roll, rather than sitting on a bed of mortar.

Clay roofs can take a dry ridge because the ridge tiles are an independent part. They need to be of a profile the system's parts will fit, usually half-round or angled, and sized to cover the top course on both sides. Our guide to half-round and angled ridge tiles shows the two shapes side by side.

One practical point is the top batten. A dry ridge is fixed to timber, so the batten at the apex has to be sound and positioned correctly for the system. On a roof being re-covered that is straightforward. On an existing roof the batten may have to be added or replaced, which is a reason to look before quoting.

Older plain tile roofs are the ones most likely to need a conversation. Tiles that have been on a roof for decades may be hand-made, cambered or uneven, so the two sides at the ridge may not line up as neatly as a modern, machine-made roof. A dry system tolerates some variation, but a big gap or a sagging top course can mean spacers, a different ridge tile, or work on the timbers first.

BS 5534 itself allows for this. BSI itself notes that the standard's advice may not suit certain older roofs, particularly traditional or reclaimed coverings. In plain terms, a roof of reclaimed clay may need an approach that respects its age instead of a standard kit, and your roofer ought to explain what is being proposed.

Also look at the ridge itself. Mortar that is cracking and falling away tells you the bed has failed, but it does not tell you what is underneath. The survey lifts a few tiles, checks the battens and rafters along the top and decides whether a straight swap to dry-fixing is sound. If you are curious how this works on a house with an existing roof, see fitting dry ridge to an existing roof.

Clay is chosen for its colour as much as its strength. Plain tiles weather unevenly, with orange, brown and darker patches that no factory finish copies exactly, so a new ridge will look different from the tiles it caps. That is not a fault. A new ridge tile tones down over the seasons, and the colour difference is often visible only from certain angles.

You do get a choice. Dry ridge systems are made to take clay ridge tiles, so you can keep a clay ridge in a colour near your tiles, or reuse your existing ridge tiles where they are sound. Reclaimed ridge tiles can blend better with an old roof than new ones, though they need cleaning of old mortar before they are fixed again, and a cracked one should not be reused.

A home inside a conservation area, or a listed one, gets extra attention from the council on how its roof looks, so talk to the planning team there before any change of material. The same ideas apply when you are repairing only part of the run, where the new section should sit close to the old.

Dry ridge is not the only answer. Mortar is not banned, and plenty of old roofs carry a bedded ridge that has lasted. What changed is the thinking about fixings: according to Marley, the 2014 revision of BS 5534 stopped trusting a mortar bed by itself to hold ridges and hips, so bedded work calls for mechanical fixings as well. Marley adds that following BS 5534 is a matter of good practice, not law.

So the choice is a practical one. Where the ridge is straight, the timber is sound and the tiles are in good order, dry-fixing gives a mechanical hold and removes the mortar that cracks. Where the roof is old and the tiles uneven, a bedded ridge with proper mechanical fixings can be the better fit. Our page on whether dry ridge beats mortar compares the two fairly.

We look at the real roof, share photos of the ridge and the battens, and set out one written total afterwards. Begin by emailing or messaging a view of the ridge taken in your garden, plus a close-up of any tile that has cracked or slipped. Our dry ridge and dry verge page shows what else we cover.