Chapter 1: Why do our ridge tiles and verges keep loosening on the Four Marks hilltop?
What we find
The roads in Four Marks reach about 215 metres, and the ridge is open to wind from every side. Gusts lift at the top edge of a roof first. On many houses the ridge tiles and the verge (where the tiles finish along a gable end) were laid on a sand and cement bed, which cracks as it ages and no longer grips the tile.
From the garden, a ridge tile that sits slightly proud of its neighbours, a dark gap at the bedding, or pieces of mortar in the border all show the bond has gone. Wind-driven rain then gets under the loose tile and into the roof space. A loft hatch stain under the ridge line, or damp at the top of a gable wall, completes the picture.
What we fix
On an exposed site we would rather not rely on mortar at all. The current standard, BS 5534, calls for ridge, hip and verge parts to be mechanically fixed, and BS 8612 covers dry-fix systems. We lift the existing ridge, check the tiles, and refit them to a continuous batten with clips or screws, bedding nothing in mortar. Verge caps are fitted dry in the same way, and the batten ends are sealed against driven rain.
Where the gable tiles are broken, they are replaced to match. For a typical semi, the reported UK range for a dry ridge is £900 to £1,600, with scaffold extra at £300 to £900, and the written quote is fixed after our survey. See our ridge, verge and dry-fix service for the full approach.