Where a roof slope stops at a gable wall, the last tiles overhang the brickwork or stone by a small margin. That edge is the verge. Traditionally the gap beneath those overhanging tiles is filled with a mortar bed, and a row of tiles or a mortared fillet is pointed over it. A dry verge does the same job with a manufactured section that is fixed mechanically, so no mortar is needed to hold it.
It matters because a gable is the part of a roof that faces the wind directly and has nothing on one side to shelter it. A verge that works loose can be seen from the pavement and mended cheaply if caught early, but left alone it can let water into the wall head. This guide explains the systems, the standard that covers them and the weak points we look at first. If you already know you have an older roof and want to know whether a dry verge can go on it, our answer on fitting dry verge to an older roof deals with that question, and the wider ridge and verge service page sets the work in context.
What the verge does, and what fails there
A gable verge has three jobs. It closes the gap between the last row of tiles and the wall so rain cannot blow in. It holds the edge tiles down against the lift that wind creates at an exposed corner. And it sheds water clear of the wall below. A traditional mortar verge can fail at any of them.
The usual failure points
- The mortar bed. It cracks and loosens because the roof and the wall do not shift together. Once the bed lets go, the edge tiles above it are held by little more than their own weight.
- The undercloak. This is the strip of slate, fibre cement or plastic beneath the edge tiles that carries water into the gutter. If it has rotted or slipped, water runs behind the verge.
- The edge tiles. Tiles at the verge are cut or are special verge units. Their nail fixings can corrode, and once one is loose its neighbours take more load.
On a gabled house we go to the verge early in the survey, because wind lifts that edge first and water finds a way through the weakest bed. That is a pattern we see on site, not a statistic. A dry verge swaps the mortar for a fixing that does not crack.
Continuous and unit dry verge
Dry verge systems fall into two families, and the difference is how the finishing piece is made.
Continuous dry verge
A continuous system runs along the gable in long lengths, usually an extruded plastic section, with each piece butting against the next. The edge of the section tucks under or over the last row of tiles, and a clip or a cloak section ties it to the batten. The effect is a clean, unbroken line along the edge of the roof, with no mortar joints to crack.
Unit dry verge
A unit system uses individual shaped tiles, normally the same material and colour as the main roof covering, for each place along the verge. Each unit is clipped or screwed to the batten and interlocks with the next unit and with the tiles beside it. The appearance is closer to a traditional tile-and-a-half verge, because the verge is built from tile-shaped parts.
Which suits which roof
Continuous verges go on fast and suit long, straight gables with plain, modern coverings. Unit verges follow the profile of the tile and so blend better with clay and with plain tile roofs, where the look of the edge matters. Both are fixed mechanically, and each product is designed around specific tile profiles.
A dry verge is chosen to match the tile as well as the gable. A section designed for one profile does not become a tested system on another.
How a dry verge locks to the tile and the batten
Whatever the product, the principle is the same: the verge section is secured to something that cannot move. In a tiled roof that something is the batten, the timber strip the tiles are hung from, and in some systems the rafter or a gable ladder beneath the overhang.
- Prepare the edge. The old mortar bed and any broken verge tiles come away, back to the last good row of ordinary tiles. The undercloak is checked and renewed if it has failed.
- Fix the cloak or base section. A supporting section is screwed or nailed to the batten ends so it presents a firm edge at the correct line.
- Locate the verge piece. Continuous sections are slid or clipped onto the cloak and fixed through to the battens. Unit pieces are seated over the edge tiles and secured with their own clips.
- Fix the edge tiles. The last tile in each course is fixed with clips or screws to the batten as the product specifies, rather than only relying on a nail.
- Finish the top. At the ridge end, the verge connects to the ridge system or its end cap. Where the ridge is being redone in the same visit, our guide to ridge re-bedding covers that half of the work.
What stands out about a properly fitted dry verge is that no single part carries the load alone. The clip holds the tile, the cloak holds the section and the batten holds both. If one fixing is damaged, the rest keep the edge in place until it is repaired.
BS 8612: the test behind a dry verge
BS 8612 is the test a dry verge system is put through, and Marley, the tile manufacturer, says an untested product cannot demonstrate compliance. That makes it the first thing to check on a dry verge: is the product tested, and is the test for the tile you have?
The standard sits alongside BS 5534, the code for slating and tiling. After the 2014 revision of BS 5534, a verge is expected to have mechanical fixings, because a mortar bed on its own is not relied on to hold the edge. A dry system that is tested to BS 8612 is one way of meeting that expectation; a mortar verge with added mechanical fixings is another. Our guide to BS 5534 and BS 8612 explains the difference in more detail.
What a data sheet should tell you
- Whether the system is tested to BS 8612 and for which tile profiles.
- The fixings, including type, number and spacing, that the tested system uses.
- Any limit on roof pitch or on the exposure of the site.
- Whether it is for new work only or can be used on an existing roof.
Fixing spacing is a matter for the data sheet, not for a rule of thumb from us. We follow the manufacturer's instructions for the product on your roof and keep the data sheet with the survey record.
Why testing matters on an edge
An edge tile has no neighbour on one side to help hold it, which makes it the most exposed piece of the covering. A tested system has been made to prove that the verge parts stay in place under load. An untested one has not.
Why gable roofs lose their verges
Hip roofs have no verge, because every slope ends at a ridge or hip line above an eaves. A gabled house has two, and each is a long run of exposed edge. That is the plain geometry behind many verge repairs.
Wind at the corner
Wind that blows across a gable wall has to go somewhere. At the edge of the roof it rises over the verge, and the tiles at that edge feel the greatest lift. A mortar bed that is already hairline cracked gives the wind a way in. Once an edge tile moves, the next tile has lost its neighbour, which is how a small fault can spread along the verge.
Water behind the bed
Rain gets into hairline cracks in the mortar and into the joint between the bed and the wall. In winter that water can freeze and widen the cracks. We do not state frost or rainfall figures for the Stroud area, and nothing here depends on them: the mechanism is the same wherever the roof is.
Neglected gable ends
A gable is often the part of a roof that is hardest to see and hardest to reach. Ladders at a gable end can be awkward on a sloping garden or a narrow lane, so nobody looks. A verge that has been loose for some time can have let water into the wall head, or into the loft along the gable, before any stain shows inside.
If you can see a gap, a sagging line or mortar on the ground beneath a gable, treat it as a prompt to have the verge looked at. Our guide on older roofs and dry verge covers what changes when the roof is not new.
Costs, access and what the written quote shows
Dry verge is priced by the metre, as ridge and hip are, and the sourced per-metre numbers below are for ridge and hip: MyBuilder's dry ridge guide, updated in August 2026, gives £40 to £60 per metre, while Checkatrade's roof repair guide (October 2026 heading) lists £50 to £70 per metre for dry ridge and £70 to £100 per metre for dry hip, both excluding VAT. Those are national figures for other parts of the roof, shown here for context only. A verge is priced after the survey, because its length, its undercloak and the condition of the edge tiles all differ.
Access is often the biggest part of a verge repair. A gable can need scaffold up the side of the house, and on a terraced hillside the narrow passage beside a gable can limit what can be carried through. For scaffold, MyBuilder gives about £1,125 on a re-roof and Checkatrade £700 to £1,300. We plan access at the survey and list it in the written quote, not on the day.
What the survey records
- The length of each verge, measured at the survey.
- The state of the undercloak and edge tiles, photographed from the roof.
- The tile type, so the right dry verge product can be specified.
- The access route and any neighbour's land we would need to cross.
The quote then covers scaffold, stripping, the verge system, tiles where needed, labour, waste and making good. We give our 10-year workmanship guarantee on paper and leave the site cleared. To start, phone 01453 933613, or message gable photographs to us on WhatsApp, or use the form on this page.