Chapter 1: Our 1980s house in Hook has a cracked ridge and crumbling verge. Is the roof finished?
What we find
Rarely. Concrete interlocking tiles were the standard covering on estate houses of the 1980s, and those tiles are made to last. What gives out first is the mortar along the ridge, the line of capping tiles at the very top, and along the verge, the sloping edge above a gable wall. Cement mortar shrinks, cracks and lets go after a few decades, and the tiles it held start to move.
You may see grey crumbs on the path, a gable edge where the mortar has fallen away, or a ridge tile sitting out of line. In the loft, daylight at the ridge or a damp patch on the timber below is the confirmation. Because streets were built to one pattern, a neighbour's roof is usually in the same state as yours.
What we fix
We lift sample tiles to see what condition the covering is in. If it is sound, which is the usual result, we remove the old mortar and re-fix the ridge and verge mechanically, as BS 5534:2014 expects, in place of bedding them in mortar again. Dry-fix systems, covered by BS 8612:2018, hold the tiles with screws and clips, so the roof no longer depends on a bond that will fail.
The roof is then left weather-tight for years without a re-roof. Published UK prices for dry ridge work on a semi start at £900 and top out at £1,600, scaffold being £300 to £900 on top, and our own figure follows the survey. Dry verge has no reliable published price, so we quote it from your measurements. The options are laid out in our notes on ridge, verge and dry-fix work.