Chapter one
Horsham Stone and clay tile on Slinfold's timber frames
The oldest buildings in Slinfold are timber-framed under stone or handmade tile, and the roof and the frame depend on each other.
A timber-framed house is built differently from a brick one, and its roof shows it. Horsham District Council's 2020 appraisal says Slinfold's oldest buildings have timber frames and gables, covered in handmade clay tile or Horsham Stone, in a village that sits on Weald Clay. The oak frame carries the rafters and the rafters carry the covering, so a leak seldom stays put. Water that gets into a joint can run along the timber and surface as a stain in another room entirely. So we trace the damp backwards to its source before any figure is mentioned, and treat a ceiling mark as the place to start looking, never as the position of the hole.
At a glance
- Oldest buildings are timber-framed under stone or tile
- A roof's existing stone slates are reused first
- Listed roofs can need consent for new materials

1.1 What we check on a framed roof
From the ground and a ladder we sight along the ridge, the top line where the two slopes meet, for any dip that suggests a rafter or wall plate has moved. We check the verge, the sloped edge where the tiles finish against a gable wall, for anything loose, and the valleys, where two slopes funnel their rain into one shared channel, for split lead or silt. From the loft hatch we look for chinks of light, tide marks on old timber and soft wood at the rafter feet, where water collects. Handmade tiles are slightly uneven, so a few cracked ones among sound neighbours can often be swapped without stripping the slope. Photographs of your own roof reach you before any price does.

1.2 Relaying and repairing Horsham Stone
Horsham Stone, a flaggy sandstone, is split into thick slates and laid in diminishing courses, meaning big slabs along the gutter line and ever smaller ones towards the top. The Stone Roofing Association's guide ranks reusing a roof's existing slates above every other repair route, and advises against stone lifted from other buildings whenever there is a choice. So when a slab slips, we lift it, inspect the fixings and the battens beneath, the slim timber laths the slates hang from, and set the same stone back. Where pieces are lost, new Horsham stone is the proper way to fill the gap if it can be sourced. Our Horsham stone roofing page covers sorting and relaying a whole slope. A listed house is different: swapping in another material can count as work needing listed building consent, so we ask Horsham District Council before anything is ordered.
Horsham Stone roofs in brief
- What it is
- A calcareous, flaggy sandstone used for roofing and flooring
- Double lap
- Random-sized slates, graded in size, big near the eaves and small near the ridge
- Single lap
- Unique to Horsham stone roofs, with joints weathered by Welsh slate shadows
- Repairs
- Existing slates reused before anything else; new stone for any gap
- Never mix
- Limestone slates with sandstones
Source: Stone Roofing Association, Horsham Stone Roofs; Horsham District Council, Slinfold appraisal, September 2020




