The short answer
A well-fitted dry ridge generally lasts longer than a mortar-bedded ridge, because the part that fails first on a bedded ridge, the mortar, is not there. The ridge tiles themselves last as long as the roof tiles. The parts that age are the plastic or fabric components, the fixings and any ventilated strip. Check the maker's guarantee for the components, but treat it as a guide to the product, not a promise about your roof. Fitting quality matters just as much.
What a dry ridge is made of
A dry ridge has four parts: the ridge tiles, a batten or support that carries them, the fixings that hold them down, and a flexible strip under the tile edges that seals the gap while letting a little air through. Each part ages in its own way. Clay and concrete tiles are very long-lived, and a tile that is not cracked or spalling is not the weak link. The question of lifespan is therefore really a question about everything else. Our guide to how a dry ridge is fitted shows how the parts fit together.
What wears out first
The seal strip is the part most exposed to sun, frost and wind-driven grit. Fabric and rubber strips can harden, crack or pull away from the tile edge. Plastic clips and brackets can become brittle in time, particularly in the ultraviolet light on a south-facing roof. Stainless or coated screws hold well, but cheaper plated ones can rust and loosen. Timber battens are protected from rot by the tiles above, but a leak elsewhere can still reach them. Most of these are small items that can be replaced without lifting the whole ridge.
Why fitting matters as much as the product
A good product badly fitted will fail early. If the fixings miss the rafter, if the batten is not straight, or if the screws are overtightened and crush the clip, the ridge will start to loosen within a few winters. A well-fitted system, with fixings into sound timber at the right spacing, keeps its grip for much longer. BS 8612:2018 sets the performance requirements for dry-fix products, and BS 5534:2014 asks for mechanical fixing of ridge, hip and verge components. A system chosen and fitted to those expectations gives the best chance of a long life.
Reading a maker's guarantee
Many suppliers give a long guarantee on their dry ridge parts. That tells you the maker has confidence in the product, but it is a guarantee on materials, not on your installer's workmanship, and it may exclude wind damage or incorrect fitting. Ask what it covers, how it is claimed and what records you need. Our own work carries a 10-year workmanship guarantee in writing, which covers how a system is fitted. It is not insurance, and it does not replace the maker's terms.
Signs that a dry ridge is ageing
Look from the ground for a ridge tile sitting out of line, a gap showing at a joint, a seal strip hanging or a clip visible where it should not be. In the loft, daylight at the ridge or staining on the timber below can show water getting in. If you see any of these, have the ridge checked soon. Catching a loose fixing early is a small repair. Waiting until a tile has slid is a bigger one. Our page on signs your ridge tiles are failing lists the warning signs for both types of ridge.
Things that shorten the life of a dry ridge
Exposure is the biggest. A ridge on an open site takes more wind, rain and sun than one tucked among other roofs. Moss and lichen growing along the ridge can lift seal strips and hold moisture against clips, so keeping the top of the roof clean helps. Roof movement is another: a house with settling or a sagging ridge beam puts steady strain on a rigid batten. Finally, later work by other trades can do harm. Aerial fitters, solar panel crews and chimney sweeps who walk on a ridge can crack tiles and knock fixings loose, so ask anyone who goes up to take care of the ridge line.
Compared with mortar
A mortar ridge is cheaper to build and looks traditional, but the bed cracks as the roof moves and needs repointing or re-bedding at intervals. Our page on how long ridge mortar lasts covers that side. A dry system costs more to install, with a reported typical UK range of about £900 to £1,600 for a semi-detached house before scaffold. Your fixed quote follows the survey. Over many years the saving on repair visits can offset part of the difference.
What we do
On the survey we look at the condition of the existing ridge, photograph the problem areas and tell you whether a repair, a re-bed or a dry system is the right answer. We fix to the standard and explain the choice. The full range is on our ridge, verge and dry-fix page.
Every roof is different. A free survey with photos settles it for yours.
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