Stage 02 · Stone slate
The one Horsham slate roof
Stone House is the only building in the conservation area roofed in Horsham stone slates, and any stone slate roof asks for a careful approach.
Stone House is a single entry in a long list of clay tile and timber, and the appraisal singles it out for exactly that reason. Horsham stone slate is a thick, natural stone cut into slabs that are laid in overlapping courses, and a roof of it looks and weathers like nothing else around. If you live on a street with one, or your own roof is stone slate, two things matter more than anywhere else: do not assume it can be swapped for something lighter, and do not let anyone strip it without a plan for the slabs.
What happens to the slabs when a stone slate roof is repaired?
Each slab is taken off by hand, checked and sorted. Sound ones are set aside for relaying, and cracked or flaking ones are replaced from reclaimed stock so the courses keep their character. A repair is therefore slower than on a tiled roof of the same size, and the written price reflects that after the survey shows how many slabs are in doubt. Reclaimed stone slate has to be found, and the supply sets the timetable more than any roofer can. Stone slate repairs usually sit in the pitched roofing family of work, with lead for the valleys, flashings and abutments.
A stone slate roof is repaired slab by slab, and the sound ones are worth more than new.
Checking a stone slate roof
- Slabs
- Cracked, flaking or slipped
- Fixings
- Pegs or nails still holding
- Valleys
- Lead lining sound
- Stack joint
- Flashing tight to the brick
- Timbers
- Laths and rafters free of rot