Chapter one
Danehill's clay tile roofs around the green
The core grew between the early 16th and late 18th centuries, and tiled roofs here can be far younger.
Danehill's older core grew up around its green, where minor roads met the historic London to Lewes route. The conservation area appraisal calls clay tile the main roofing material on older properties, with slate arriving in the 19th century. From the lane a clay roof can look perfectly sound, so our survey begins at the eaves and in the loft, where failure shows first.
At a glance
- Clay tile is the main covering on older properties
- Failed nails let tiles slip long before clay wears out
- A lifted tile shows the battens and underlay beneath

1.1 Reading a clay tile roof
Along every course we look for dropped, cracked or lifted tiles, and for moss wedged into the overlaps, which keeps water pressed against the clay. Plain clay tiles hang by small nibs from battens, the thin timber laths fixed across the rafters, and each tile is held by a nail or peg. Those fixings can rust or loosen long before the clay gives out. Inside the loft we check for daylight at the tiles, darkened rafters and any underlay that has perished. Marley cites a minimum life of 60 years for clay tile, yet the Building Conservation Directory cautions that the figure fits old tile roofs poorly, so the evidence on your own roof carries more weight than its date.

1.2 Mending a roof beside the green
Repairs should echo the tiles around them: the same size, a close colour and the same coursing. Sound tiles stay, slipped ones are re-fixed and only cracked ones are replaced, with salvaged tiles used where new ones would glare. A handful of failed courses on one slope calls for a repair. Soft battens across a whole slope call for that slope to be stripped and re-laid, and the photographs we send show you which case you have. Where an older repair used a tile that does not match, the photographs point it out, so you can decide whether to go back to the original pattern. Our roof repairs page explains how a leak is traced to its source.
1.3 The ridge line
Ridge and hip tiles take the first blast of weather. Since the 2014 revision of BS 5534 they are no longer left to mortar alone; each is also fixed mechanically, so a cracked ridge is re-bedded with screws or clips behind it instead of a quick repoint.

Fig. 1 On the survey Clay tiles slipped where the nails have failed





