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Dry verge or barge flashing on a tiled gable

Updated: 23 October 2026

Water is running down the gable wall, the mortar at the tile edge has cracked, and the search box offers both a dry verge and barge flashing. They are not two names for one part. The bargeboard is the timber or uPVC face. The verge is the edge of the tiles or slates. A barge flashing, in the sheet-roof sense, is a folded metal cover for profiled sheets. On a tiled house the usual answer is a dry verge. The [barge flashing comparison](/hub/diy-supplies/barge-flashing) is the three amazon.co.uk rolls we kept, and none of them is a dry verge or a folded barge. A qualifying purchase can earn a commission at no extra cost to you.

Water is running down the gable wall, the mortar at the tile edge has cracked, and the search box offers both a dry verge and barge flashing. They are not two names for one part.

Our top picks

Winfox Winfox aluminium flashing roll 0.2 mm

Best overall

Winfox Winfox aluminium flashing roll 0.2 mm
4.8/10about £14.99
View offer
Bostik Bostik Flashband 100 mm x 10 m

Rank 2

Bostik Bostik Flashband 100 mm x 10 m
8.4/10about £13.34
View offer
Target Control Target Control silver butyl 100 mm x 5 m

Best value

Target Control Target Control silver butyl 100 mm x 5 m
6.2/10about £11.39
View offer
On this page
  1. 1.Three names, three parts
  2. 2.When the dry verge is the answer
  3. 3.If you still use mortar
  4. 4.What not to stick on the board
  5. 5.Which basket to fill

Three names, three parts

The bargeboard is the board fixed along the gable, covering the ends of the rafters. It does not, by itself, weatherproof the tile edge. BuildWiz's bargeboard note makes that split plain: water still gets past cracked mortar at the verge, and the board is not the seal. The verge is the sloping edge of the covering. A barge flashing is a 90-degree metal cover over profiled sheets, sold in lengths such as 3 m. The board's name does not make the tile edge a steel barge. Ordering a 100 mm tape because the board is easy to reach leaves the tiles loose to the wind. If you can see box profile instead of tiles, that edge is the folded barge on the buying guide.

When the dry verge is the answer

On tiles, the product has to suit that tile or slate and do the four jobs the Roof Tile Association lists for dry-fix verges. It must resist the predicted wind load. It must close the gap between the tiles and the wall or the bargeboard. It must drain water off the gable rather than back into the roof or down the wall. And it must count as a fixing for the verge tiles, not only as a cosmetic cap. BS 8612 is the test specification the Association points to for that kit. Mortar bond is not counted as a mechanical fixing under the Association's account of BS 5534. Verge tiles need at least two mechanical fixings, and a properly engaged dry-verge cap can be one of them. A profiled metal roof is not this job.
Winfox Winfox aluminium flashing roll 0.2 mm

Testsieger

Winfox Winfox aluminium flashing roll 0.2 mm
4.8/10about £14.99
View offer

If you still use mortar

NHBC Standards 7.2.19 still describes a wet verge when that is the specification in front of you. The mortar bed is 100 mm. The undercloak is at least 150 mm wide, laid face down. Plain tiles should project about 38–50 mm past the verge. Interlocking tiles should project about 30–60 mm. Plain tiles are not an undercloak below 30 degrees, and they are not an undercloak on a bargeboard. Verge clips are nailed twice. Those figures are the wet-verge rules, not a target for a dry-verge clip. If the verge has already shed its mortar, the mechanical dry verge is the detail building control is described as expecting. The screw sequence for a sheet-roof barge is on how to fit barge flashing, and it does not apply to these clips.

What not to stick on the board

None of the three amazon.co.uk listings is a dry verge. Flashband is bitumen tape named for lead-flashing repair. The silver roll's stored reviews are often a pond, a freezer, or a pipe. The Winfox coil is titled 0.2 mm, with a pack size that conflicts with the title. A strip along the bargeboard does not resist the wind load on the verge tiles, it does not clip to the battens, and it does not drain the tile edge. We have no shelf price for a dry-verge kit, because none was in the kept listings. Ask a roofing merchant for the system that matches the tile already on the roof.

Which basket to fill

Tiled or slated gable, water on the wall, cracked mortar: specify a dry verge to BS 8612 for that tile, with the four jobs above, and treat mortar as the exception only where the wet-verge rules still apply. Profiled metal sheets: leave this page and order a folded barge, about 0.7 mm, in a 3 m length. A steel barge on a tiled gable covers the wrong edge and leaves the tiles unfixed.

Common questions

Is a barge flashing the same as a bargeboard?
No. The bargeboard is the face board on the gable. Barge flashing, when the term is used for sheet roofs, is a folded metal cover over profiled sheets. The verge is a third thing: the edge of the tiles or slates. Water on the wall usually means the verge, not a missing steel angle and not a bare board. Buying tape because the board is called a bargeboard mixes the three names into one product.
Why is water running down the gable wall?
The gap at the tile or slate edge is open, often because the mortar has cracked and dropped out. Water then runs off the covering and down the wall instead of being thrown clear. The Roof Tile Association expects a dry verge to close that gap and to drain water away from the gable. Painting the streak, or sticking tape to the board, leaves the gap where it is.
Can I remortar the verge and stop?
Only where a wet verge is still the specification, and then with the NHBC bed, undercloak, and projection for that tile. Mortar bond is not the wind fixing. On a new extension, mechanical fixing is what building control is described as expecting. A dry verge is the usual close when the mortar has already failed.
What does a dry verge have to do?
It has to resist the predicted wind, close the gap, drain water off the gable, and act as a fixing for the verge tiles. BS 8612 is the test specification for that kit. A cap that only hides cracked mortar, with no fixing into the battens, has not done those jobs.
When is a steel barge the right product instead?
When the roof is profiled metal sheet, not tiles or slates. The piece is a folded barge, about 0.7 mm, typically in 3 m lengths, with a wing such as 150 mm or 200 mm. A steel barge on a tiled gable covers the wrong edge and leaves the tiles unfixed.

Related pages

Lead flashing or Flashband

Barge flashing

Best barge flashing among these three kept listings

Barge flashing sizes for sheets, tiles, or a patch

How to fit barge flashing on sheets or repair tape

Sources

Public UK sources and the amazon.co.uk listings compared on this page. Shelf prices read 19 October 2026. Updated 22.10.2026.

  1. Cladco flashing installation (retrieved 22.10.2026)
  2. Cladco barge datasheet (retrieved 22.10.2026)
  3. NHBC 7.2.19 Fixing tiles and slates (retrieved 22.10.2026)
  4. NHBC 7.2.20 Weathering details (retrieved 22.10.2026)
  5. Lead Sheet Association guide to rolled lead (retrieved 22.10.2026)
  6. Roof Tile Association on BS 5534 (retrieved 22.10.2026)
  7. Bostik Flashband TDS00142 (retrieved 22.10.2026)
  8. HSE roof work (retrieved 22.10.2026)
  9. Sureclad metal bargeboards (retrieved 22.10.2026)