Chapter one
Slate roofs on Heath-era houses
Slate carried the town's Victorian and Edwardian houses, and a slate roof usually fails at its nails and valleys before the stone wears out.
The London to Brighton railway opened in 1841 and the town of Haywards Heath grew on the heathland beside it, so its older streets date from the decades after that. The Heath Conservation Area appraisal names slate as the roofing material commonly used on the Victorian and Edwardian houses. Natural slate is split stone, laid in overlapping courses and hung from battens, the thin timber strips nailed across the rafters. One national cost guide says a slate roof laid well can run to 80 to 100 years or more. Treat that as a typical range, never a guarantee, because on these roofs the nails and the lead around them usually give out before the slate does.
At a glance
- The appraisal names slate for Victorian and Edwardian houses
- Rusted nails let slates slip before they crack
- BS 5534 indicates 20 degrees as the minimum slate pitch

1.1 Where a slate roof lets go
The usual fault is a slipped slate. The nail holding it has rusted through, or the slate has split at the nail hole, and it sags out of line and opens a gap in the course. Water then reaches the batten and whatever underlay lies beneath. We walk the eaves line looking for gaps in the pattern, then check the valleys, the internal angles where two slopes meet and the water from both runs down one channel, and the lead flashings around chimney stacks and bay windows. A stain on a bedroom ceiling is rarely under the gap, so we follow the water back up the slope. Every fault is photographed and goes into the written quote.

1.2 Repair, patch or strip
A handful of slipped slates is a repair, and we replace them with slates matched for size and thickness. Slipping spread across a whole slope points to nails failing everywhere, and patching that roof only buys a season or two. We tell you which one yours is, and why. Pitch matters on new work: Cupa Pizarras, a slate supplier, reads BS 5534 as setting a minimum of 20 degrees for natural slate, and advises against hook fixings on anything below 25 degrees. A shallow lean-to or porch roof therefore needs its pitch measured before slate goes back on. Our slate roofing page covers relaying, and the smaller jobs sit under roof repairs.
Slate figures for a Heath roof
- Typical life
- 80 to 100 years or more when well installed (MyBuilder)
- Minimum pitch
- 20 degrees for natural slate, read from BS 5534 (Cupa)
- Hook fixings
- Not used below 25 degrees (Cupa)
- Headlap at 25 degrees
- 95 mm for a 500 x 300 slate (Cupa)
- Slate re-roof guide
- £100 to £180 per m² (MyBuilder)
Source: MyBuilder slate roof cost, updated 21/08/2026; Cupa Pizarras, fetched October 2026






