Slate working

Roof slates

Vernacular slating is found on a great number of buildings in the UK with many regional variations relating to the local available materials and building styles. Slates are made of various different stones and vary in size, as they were cut in the quarry to the sizes of available stone.

Modern slates are regular in size and nailed to battens, whereas vernacular slates are usually of random sizes and are fixed by a peg to the top of battens where they are held under their own weight.

Slate making is now mostly mechanised with quarries producing slates in various regular sizes and shapes. Random sized slates are not being produced in great numbers and are therefore not readily available for vernacular roofs.

Handmade slate objects

The craft started as an offshoot of the slating industry. Households would fashion useful items for people and created decorative items from offcuts of slate.

Slating is divided into two areas, which are generally practised by different craftspeople:

• Cutting/riving slate: the craft of cutting slates, usually in the quarry, for use in roofing
• Slate working/slate masonry: the craft of working slate to make household objects

• Market issues: Vernacular slates are more expensive than modern slates and are often not readily available for vernacular roofing projects.
• Supply issues: Quarries often can’t respond quickly to demand and so lead times can make using the vernacular tiles less viable.
• Lack of skills and knowledge of regional slating types: Vernacular slating techniques are highly regionalised, and the viability of the craft varies depending on the slate or stone type, and hence depends on the region.
• Conservation of buildings: The protection/conservation for vernacular slating styles and techniques vary across the country, and in some places they are discarded and substituted with modern slating.
• Whilst there may be an intention to replace vernacular roofs, a lack of availability of slates and budget constraints have meant that many historic roofs have been lost.
• Competition with large companies: smaller slating companies and craftspeople are out competed by bigger building companies
• Ageing workforce: particularly in relation to Westmorland slate working
• Availability of raw materials
• Competition from cheaper imports

• Stone Roofing Association
• Historic England – for Grade I and II* listed buildings where grants are involved
• Cadw – for Grade I and II* listed buildings where grants are involved
• Historic Scotland – for Grade I and II* listed buildings where grants are involved
• Society for the Protection of Ancient Buildings (SPAB)
• Stone Federation Great Britain
• Worshipful Company of Masons

Roofing slates

• Richard Jordan
• Terry Hughes

Slate masons

• Brendan Donnelly, Coniston Stonecraft
• Lakeland Stonecraft
• Honister Slate Products
• Liam Cartmel-Walker is currently training as a slate mason at Coniston Stonecraft

Welsh slate crafts

• Snowdonia Natural Slate Products
• Valley Mill Slate Crafts
• Bacchante Crafts
• In Slate
• The Slate Workshop

http://www.stoneroof.org.uk/cnts.html

https://www.buildingconservation.com/articles/sourcingslates/sourcingslates.htm

SPAB Technical Advice Notes – https://www.spab.org.uk/advice/technical-advice-notes