Why is my dry verge rattling or clicking?

Beside a gable wall, the last run of tiles is finished with the verge. A dry verge system replaces the old mortar with a mechanically fixed cap, laid as a continuous length or as interlocking units. Clips, screws or both tie each piece to the battens (the timber strips that carry the tiles) or to a fixing strip, and the cap grips over the last tile.

A system built that way should be silent. When it is not, one of the fixings has stopped doing its job. A cap that can lift a few millimetres in a gust, and then drop back onto the tile, produces a tap or a rattle. A cap that shifts as the plastic expands and contracts makes a slower, clicking sound, often heard on sunny mornings or at dusk when the temperature changes.

Nothing about the sound tells you the verge is about to fail, but it does tell you something is not seated. Noise is a good reason to have the gable looked at before the next big wind.

The most common cause we look for is simple: a fixing is absent or loose. During installation a clip can be left out where two units meet, or a screw can be driven into a batten that has since softened. Over time, vibration from wind and the weight of a cap that is not properly held can wear a hole larger, so a fixing that was firm becomes slack.

The signs are visible from a ladder or a close photograph. Look for a gap between the cap and the tile edge, a unit that sits at a slightly different angle to its neighbours, or a joint where two units no longer line up. Pressing gently on the cap should not move it. If it lifts, flexes or taps against the tile, the fixing beneath is the first suspect.

Why one loose unit matters

Dry verge units are designed to share the load. When one lifts, the units either side carry more of the wind and can begin to work loose too. Our answer on dry verge systems explains how the pieces lock together and why a single weak point matters.

Plastic expands when warm and shrinks when cold. A dry verge is built to allow for that, with gaps and slots that let each unit move a little without buckling. If the fixings are over-tightened, or if a screw is driven straight through a slot rather than into the centre of it, the unit cannot slide as designed. The movement then happens in jerks, which you hear as a click or a tick.

Mixed components can cause the same fault. Caps from one manufacturer will not always sit properly with clips or end pieces from another, and a profile that is not matched to the tile leaves gaps that rattle. A system should be one tested to BS 8612; untested caps cannot show compliance. Using the fittings made for the system, rather than substitutes, is part of the same discipline.

If the noise follows the sun, with ticking in warm spells and quiet when it is cold and damp, thermal movement is the likely cause and the fix is to refit the affected units with correct clearance.

We start on the roof, working along the gable from eaves to ridge, pressing each unit and checking each clip and screw. A photograph of every loose point goes into your survey record, so you can check what we found. We also look at the battens beneath, because a soft or split batten will not hold a screw however new the cap is.

The repair depends on what we find. A loose unit may need one new clip or a longer screw into sound timber. A damaged unit is replaced with the correct part. Where the whole run was fitted without enough fixings, we refix it to the system's instructions rather than patching one point. If a cap cannot be matched, because the product has been discontinued, we tell you that plainly and price a replacement run.

Your written quote covers the access, the labour and the parts. For a gable that is a short run, the repair is usually modest. If the noise comes from the whole system, replacing the verge may be the better value, and we will set out both options. Before any of that, the plastic cap is only half of the picture: the tile edge below it needs to be sound, which is what our answer on a fallen ridge tile helps you check.

That depends on the cause and the policy. Damage from a named storm may be treated differently from a fault in how something was fitted, and a manufacturer's guarantee on the product does not usually cover workmanship. Check the wording, and read our answer on whether loose ridge tiles are covered by insurance for how insurers tend to view ridge and verge damage.

Repairs and refits we carry out come with our 10-year workmanship guarantee, in writing. Our ridge, verge and dry-fix page lists the other jobs we do along the roof edge, and the site is left clear afterwards.