Chapter one
Shallow hipped slate on Heene's early houses
The earlier stuccoed houses carry shallow-pitched hipped slate, and slate rewards a roofer who reads every slope before touching it.
Slate is a hard stone split into thin tiles, and MyBuilder's slate cost guide says a well-installed one will last 80 to 100 years or more. The Victoria County History records the Heene Estate Land Co. buying most of the parish in 1863, with Heene Terrace standing by 1865, so the slate on an early house may be original, may have been recovered at some point, or may be a patchwork of both. The council's appraisal describes the earlier stuccoed houses as having shallow-pitched hipped slate roofs. Each corner of a hipped roof has a hip, the sloping line where two slopes join, and on these houses it is one of the first places we climb up to inspect.
At a glance
- The appraisal records shallow-pitched hipped slate on early houses
- BS 5534 indicates a 20 degree minimum for natural slate
- Slate hooks suit only slopes of 25 degrees or more

1.1 Why the low slope matters
A shallow roof gives rain little incline to run down, and wind-driven rain can be pushed up under the laps, the overlaps between slate courses. Pitch, overlap and fixing work together. Cupa Pizarras, a slate supplier, says BS 5534 indicates a minimum pitch of 20 degrees for natural slate in its worked example of a 500 mm slate with a 115 mm overlap at moderate exposure, and adds that slate hooks are unsuitable for any slope under 25 degrees. A repair that changes the slate size or its overlap can therefore change whether the roof sheds water properly. Where slates have slipped we ask what held them: nails that have rusted through, or battens, the narrow timber strips under the slates, that have gone soft. A tingle, a small metal strip that clips a slate back into place, is a stopgap, and the written quote describes it as one.

1.2 Chimneys and the lead that joins them
Houses of this era meet their chimney stacks and party walls with flashing, a ribbon of lead pushed into the masonry and bent down over the slates. Lead for roofs is graded by a code number that tracks its thickness, and one supplier describes code 4, at 1.80 mm, as the everyday choice for ordinary flashing. Soakers, little folded lead sheets sitting beneath the slates beside a wall, stay out of sight until a stain appears on a ceiling, usually somewhere other than the fault itself. We trace that stain back along the rafters before deciding whether the answer is new lead, new slates or both. Where the slates are sound we refix and reuse them instead of recovering the slope, and the survey photographs show you the reason. Our slate roofing and lead roofing pages set the work out in more detail.
Slate facts for a Heene roof
- Typical slate life
- 80 to 100 years or more when well installed (MyBuilder)
- Minimum pitch, worked example
- 20 degrees for a 500 mm slate with a 115 mm overlap (Cupa, citing BS 5534)
- Hook fixings
- Not for pitches below 25 degrees (Cupa)
- General flashing lead
- Code 4, 1.80 mm (Leadworx)
Source: MyBuilder slate roof cost guide, updated 21/08/2026; Cupa Pizarras; Leadworx, fetched October 2026





