Chapter one
Horsham stone on a Downs church porch
The porch roof beside the parish church shows what Horsham slabs ask of anyone who repairs them: patience, and the roof's own stone.
Pyecombe's north porch, a small roof by village standards, carries Horsham stone, the Victoria County History records. Small does not mean simple. The Stone Roofing Association describes Horsham stone-slates as calcareous, flaggy sandstones that are cut in random widths and graded by size, the largest at the bottom of the slope and the smallest at the top. It describes two ways of laying them: a conventional double lap, and a single-lapped method it says belongs to Horsham roofs alone, where Welsh slate shades bedded in mortar weather the open joints. Horsham District Council's 2022 appraisal notes that such roofs are steep, hung on timbers strong enough for great weight, and that generations of repair have produced a patchwork of both methods, shadows filling gaps where stone was scarce. Before the slabs go back they are sorted again, since their order is what keeps the roof shedding water.
At a glance
- Large slabs at the eaves, small ones at the top
- Stone already on this roof goes back first
- Stone taken from elsewhere comes last
1.1 The order of preference
The Association ranks the options clearly. First choice is reusing as many of the roof's existing stone-slates as can be saved. If gaps remain, new Horsham slates of a suitable kind are the way to fill them, where any can be found. Slates lifted from other buildings come last, because buying them encourages historic roofs to be broken up elsewhere, and if they must be used, their origin should be checked as legitimate. Reports from 2019 spoke of a shortage of new Horsham roofing slabs, with no geologically matching substitute, which is another reason to save and relay what a roof already has.
Under the stone, the timbers matter. A heavy roof depends on the rafters and battens beneath it, so on a relay the covering comes off in sections and the timbers beneath are inspected before the slabs go back.
1.2 Consent, and the church itself
Converting single lapping to double lapping is not a casual change. The Association says the loading and structural stability must be reviewed, that building control approval or a church faculty will be needed, and that a listed building needs listed building consent from the local authority. Pyecombe's parish church is listed Grade I; for as long as the Church of England still uses it, the ecclesiastical exemption applies, and the Church's own faculty route takes the place of listed building consent. A stone-roofed house or barn that is listed goes through the planning authority instead. Our Horsham stone roofing page explains lifting and relaying.
Horsham stone roof facts
- Stone type
- Calcareous, flaggy sandstone (Stone Roofing Association)
- Grading
- Big slabs low on the slope, small slabs high
- First choice
- Reuse the roof's own stone-slates
- Shortfall
- Suitable new Horsham slates if available
- Single to double lap
- Loading review; building control or faculty; consent if listed
Source: Stone Roofing Association, Horsham Stone Roofs (2009); Horsham District Council appraisal (2022)





