Dry Verge Systems › Tonypandy › Guide
The mortar along a gable edge does a quiet job for a long time, then fails quickly once it starts. On the exposed terraces of Tonypandy, where end walls stand high and the weather comes up the valley, a failing verge is among the first things to let a roof down. This is how it goes wrong.
It starts with hairline cracks
Mortar bedding shrinks as it ages, and the joint between mortar and tile opens up. Early on these cracks are thin and easy to miss from the pavement. Rain finds them straight away. Water soaks in, and in winter frost expands it and pushes the cracks wider, so the mortar loosens a little more each cold spell. Anything we find that affects the edge is pointed out before work starts.
Then the mortar starts to fall
Once the bedding gives up, pieces drop away in the wind. You may find crumbs of mortar in the garden, on the path or in the gutter below the gable end. The edge tiles lose their support as the mortar goes. They can lift, slip or rock in a gust, and a verge tile that comes off in the wind is a hazard to anyone walking below. Anything we find that affects the edge is pointed out before work starts.
- Mortar crumbs in the garden, yard or gutter
- Edge tiles out of line with the rest of the slope
- Visible gaps between tile and gable wall
- Daylight or staining at the roof edge from the loft
What gets in once it opens up
Wind-driven rain gets under the edge tiles and wets the battens and underlay beneath. Over time that shows as damp patches on the gable wall inside or staining on the loft timbers. Birds and insects use the gap too. Nests at a verge can block ventilation and bring mess into the roof space, and wasps find the gap an easy way in.
Patching mortar or changing the system
A mortar patch can tide a verge over, but it is only as good as the old bedding beside it. On a Tonypandy gable that takes constant weather, the patch tends to fail again. A dry verge removes the problem. Fixed units and tile-ends are secured mechanically, so there is no wet mortar to crack, and the edge is held against the wind and weather.
What we check and what we do
From the ground and the loft we look for the signs above, then open up the verge to see the battens and underlay. Rotten battens or torn underlay are put right before anything is refitted. We fit the new system to the tile maker's guidance and check compatibility with your tile profile first. If the roof is failing elsewhere, we say so rather than just replacing the edge.
Need dry verge systems in Tonypandy? See our dry verge systems in Tonypandy page, or call 07766 547309.
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Common Questions
Is a cracked verge an emergency?
Not usually, but it will not improve. Cracks let water in and weaken the edge tiles, so it is worth having it looked at before a storm loosens them. Keep clear of the gable if tiles look loose.
Can I re-point the verge myself?
We would not advise it. The work is at height on a gable edge, and fresh mortar on old failing bedding does not last. Please call us for a proper look rather than going up yourself.
Will a new verge stop damp on my gable wall?
If the damp comes from the failed verge, yes, it should stop. If it comes from elsewhere, such as flashings or gutters, we will find that during our check and tell you what is needed.
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Tell us what the roof is doing in Tonypandy and we will look at it. Call 07766 547309, message us on WhatsApp or use the form below.