In the vast majority of cases, yes, dry verge can be retrofitted to a roof that currently has mortar bedding, without needing to strip and replace the roof covering itself. It's one of the more popular upgrades homeowners choose when their existing verge starts showing its age.
What condition the roof needs to be in
The tiles along the verge need to be in reasonably sound condition, since the dry verge units clip and screw onto them, but they don't need to be new or unblemished. A roofer will check that the battens underneath are solid enough to take the fixing screws, and that the tile profile is one the available dry verge units are designed to fit, which covers the vast majority of common tiles and slates found across Bristol's housing stock.
This is one of the reasons dry verge is such a popular upgrade rather than a new-build-only feature, since it can be added to a roof that's otherwise in good order without disturbing the rest of the roof covering.
The retrofit process step by step
The old mortar is removed first, then the verge tiles are checked and any damaged ones swapped out before the dry verge units go on, working up from the eaves to the ridge. A matching ridge finial finishes the job, and depending on the size of the roof and how easy access is, the whole process is often completed within a day or so.
Because it doesn't usually require major structural work, retrofitting dry verge tends to be less disruptive and cheaper than people expect, especially compared with a full re-roof.
When it might not be suitable
Occasionally a roof's tile profile or its underlying condition means a standard dry verge kit won't do the job neatly, in which case a bespoke or alternative solution may be needed. Brunel Roofing Bristol will assess this during a free inspection and explain clearly what's achievable on your particular roof before any work goes ahead.
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