Ridge end caps
What are ridge end caps, and do they matter?
The short answer
A ridge end cap is the finishing piece at the open end of a ridge, usually where the ridge reaches a gable. It closes the end of the capping so wind, rain and debris cannot get in, and it gives the line a tidy finish. They matter more than they look, because a loose or missing end is often where a ridge starts to come apart.
What sits at the end of a ridge, what a missing cap lets in, and how end pieces differ on mortar and dry ridges.
What sits at the end of a ridge
A ridge is a row of capping tiles crowning the roof, and every row has to stop somewhere. At a gable, the wall at the end of the roof, the last tile would otherwise leave an open tube. The end cap is the piece that plugs it. On a traditional mortar ridge it is a shaped end tile, often with a flat or decorative face, bedded in place like the rest.
On a dry ridge it is a manufactured unit that clips or screws to the rail and sits against the capping, finishing the line in a matching colour. Hips have the same need. The lower end of a hip finishes with its own end piece, held at the foot by a metal bracket, which our page on the hip iron describes.
End caps are small, and they are easy to overlook from the ground. They are also the pieces that take the first hit when a gale comes along the length of the ridge, so they get more attention from a roofer than their size suggests.
What a missing end cap lets in
An open ridge end is a gap straight into the top of the roof. Wind-driven rain can blow into the hollow under the capping, wet the rail or the bed and find its way down to the timbers at the apex. Leaves, moss and debris collect inside, and they hold moisture against the timber.
Birds and insects look for gaps like this one. Nesting birds are protected, so an occupied nest must not be damaged or removed, and that is a reason to have the end looked at by a roofer instead of poking at it yourself. We check for nesting before any work starts.
The bigger risk is mechanical. With the end piece gone, the last capping tile loses its stop, and it can lean outwards and then slide off. Once one tile moves, the next one is loaded in a way it was not designed for. A small missing piece can turn into a stretch of loose ridge, which is why we treat it seriously.
End pieces on a mortar ridge
On a bedded ridge, the end tile sits on a mortar bed at the gable and is pointed into place. It carries a share of the load, because the whole run of capping leans toward it when wind pushes along the ridge. If the bed under it fails or the pointing goes, the end tile lifts or rotates first.
The repair is not just a new bed. The 2014 revision of BS 5534 calls for fixings on ridge and hip tiles in addition to mortar, and Marley wants one on every bedded tile and fitting. The end tile is the place where that matters most.
If an end tile is cracked or missing, the match comes into it too. Finding the same shape and colour can take some effort on an older roof, and our guide to matching ridge tiles explains how that is done.
End caps on a dry ridge
A dry ridge system has its end cap built into the design. The unit is usually fixed to the end of the rail, so it is held by metal and not by adhesion, closes the open end of the capping and carries a seal against the roof covering. It is part of the tested system, and BS 8612:2018 is the British Standard against which dry-fix ridge, hip and verge systems are tested.
The practical point is to ask for the kit by name. A maker's data sheet lists the fittings that go with each system, and an end cap from a different range may not fit the rail or the capping. A good fit is as important at the end as in the middle of the run.
Colour matching is worth checking, since end units are the pieces most visible from the street. The parts list for these systems runs from the rail to the finishing pieces.
Where the ridge meets the verge
At a gable, the end of the ridge also meets the verge, where the slope finishes against the gable wall. If the verge mortar is failing, the ridge end often goes with it, because the two pieces share the same corner and the same exposure to side-on wind.
When we survey one, we look at both together. A loose end cap with a crumbling verge beside it is a sign that the whole corner needs attention, and doing the two at once saves a second visit and a second set of access. Our page on dry verges shows the alternative to a bedded edge.
From the ground, look at the gable ends with binoculars. A cap that sits crooked, a dark gap under it or fragments of mortar below are all worth photographing. We survey the ridge, give you a verdict in plain words, then confirm the price in writing as one sum. See also our ridge tile repairs page.
Related questions
End cap questions
Can a missing end cap be replaced on its own?
Frequently, provided the capping beside it is sound and the bed or rail is still firm. The new piece needs to match the profile and be fixed properly. If neighbouring tiles have also loosened, it is better to deal with the run than to replace one cap and leave the rest.
Do end caps come in colours to match older tiles?
Modern ones come in standard colours, and reclaimed pieces can match an older roof better. A close match is realistic, a perfect one less so. We take a sample from the ridge at survey and tell you what is available for your roof.