Dry Verge Systems › Caerphilly › Guide
Mortar has been used to bed verge tiles for generations, and plenty of Caerphilly roofs still have it. Dry verge systems are the modern alternative. Neither is right for every house, so it helps to know how each works, where each struggles and what we look at before recommending one.
How a mortar verge works
A mortar verge uses cement-based bedding to hold the end tiles and fill the gap at the edge of the roof. Done well it looks traditional and suits many older houses, particularly where the tile or slate finish has a long-established character. It does not take long to check, and it saves guesswork.
The weakness is that mortar is rigid and the roof is not. Frost, wind movement and shrinkage open hairline cracks, water gets in, and eventually pieces fall out. Re-pointing becomes a repeating job on exposed gables. We look at this on site rather than guessing from the road.
How a dry verge works
A dry verge uses mechanically fixed units and trims, with tile-end pieces or caps and no wet mortar. The edge is held by fixings rather than bedding, so there is nothing to crack and wash out. Every roof in the area behaves a little differently.
It also keeps weather and birds out of the roof edge, and it can be fitted on new roofs, re-roofs and as a repair where mortar has failed. It must be fixed to the tile maker's guidance and matched to the tile profile. We explain what we find in plain terms before any work starts.
- Fixed units rather than wet bedding
- Tile-end pieces or caps finish the edge
- No mortar to crack or fall out
- Fitted on new roofs, re-roofs and repairs
Terraces and older houses
Many Caerphilly terraces have party walls rather than open gables, so verges are limited to end-of-terrace houses. Where a traditional look matters, or the roof is in a sheltered position, a well-built mortar verge can be quite acceptable. It is worth getting it looked at before the next wet spell.
On an older house with mixed or worn tiles, a dry verge may need extra care to sit well, and we check whether a matching unit exists. If the roof is generally tired, the verge is not the main concern. That is the sort of detail we check on every visit.
Estates and exposed gables
The post-war and modern estates around Caerphilly, and houses in Bedwas, Machen and Rudry, often have open gables facing the hill. In that position, mortar is under constant stress from wind and driving rain, and failing bedding is a common repair. Local weather makes this more of a concern than people expect.
A dry verge generally suits these houses better because it resists lifting at the edge and does not depend on mortar surviving each winter. It is a practical upgrade when repairs keep recurring at the same gable. We would rather tell you straight than sell you something unnecessary.
Making the choice
We look at the tile type, the condition of the roof, the exposure and what you want the house to look like. If the roof is failing elsewhere, we say so, because a new verge will not solve that. It does not take long to check, and it saves guesswork.
Please do not try to patch mortar yourself. Call us for a proper look and we will talk through both options on site. Work may need planning or Building Regulations checks, and we advise before work starts. We look at this on site rather than guessing from the road.
Need dry verge systems in Caerphilly? See our dry verge systems in Caerphilly page, or call 07766 547309.
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Common Questions
Is a dry verge more expensive than mortar?
We do not give figures in advice pages, and the answer varies with the roof. We look at the gable and explain the options on site, so you can compare like with like before deciding. Every roof in the area behaves a little differently.
Can I keep mortar on an old house?
Often yes, if the roof is sheltered and the mortar is sound. Where bedding keeps failing on an exposed gable, a dry verge is usually the more reliable repair. We assess each house individually. We explain what we find in plain terms before any work starts.
Can you mix the two on one roof?
In some cases, but the edges should look consistent and each gable has its own exposure. We check the roof first and advise on a sensible approach rather than a patchwork finish. It is worth getting it looked at before the next wet spell.
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Tell us what the roof is doing in Caerphilly and we will look at it. Call 07766 547309, message us on WhatsApp or use the form below.