Chapter 1: Why do the ridge and verge tiles on our Bordon terrace keep coming loose?
What we find
On a terrace or a run of semis, the ridge is the row of capping pieces running along the apex, and the verge is the edge of the roof where it finishes at a gable. Both were traditionally bedded in mortar, and on houses from the middle of the last century that mortar has had decades of frost, sun and rain. It shrinks, cracks and lets go of the tile. On an open site, wind then does the rest.
From the pavement you may spot a ridge tile out of line, bright patches where mortar has fallen away, or crumbs of sand and cement in the gutter. In the loft, daylight along the ridge board, or a damp patch on the timber, means water has been getting in. Because these roofs were built in a run, a terrace often fails in step along its length.
What we fix
We lift a few to learn if the tiles themselves are good and just the bedding has gone, which is what we normally find. A modern repair follows BS 5534, the British Standard that expects every ridge, hip and verge piece to be held by screws, clips or straps, with mortar no longer trusted alone. We therefore recommend a dry-fix system, where the ridge tiles are screwed or clipped to a batten and sealed with a breathable roll, and dry verge units clip over the ends of the tiles. BS 8612 sets the performance requirements for these systems.
Cost guides for a semi quote a dry ridge at £900 to £1,600, with scaffold from £300 to £900 on top. Where several neighbours share a run of roofs, a shared scaffold can bring the cost down. Your fixed quote follows the survey. The ridge, verge and dry-fix service page goes further.