Specialists in Reproduction Conservation Roofing

Random Diminishing
Conservation Slate

NEW Product for 2018

Greys Artstone Random Diminishing Conservation Slate is a cost effective alternative to natural slate producing a crafted authentic diminishing roofscape. Available in four colours: New Quarried Westmorland Green, Aged Westmorland Green, New Quarried Welsh Blue/Grey and New Quarried Welsh Heather/Purple.

greys artstone random diminishing slate home

Our range of Random Diminishing Conservation slate is manufactured to the same exacting standards as our standard slate product.

Each individual slate is hand crafted using moulds taken from slate originals. The fine edge detail and textured surface combines with realistic colouration to create an attractive alternative to natural slate.

Greys Artstone roofing slates have been designed in consultation with professional roofers and architects, to achieve an easy to lay and uniform slating format.


  • NO sorting or grading
  • Designed to diminish - Batten schedule provided
  • Weight 30kgm2
  • Indented to facilitate either 75mm
  • Construction allows easy cutting without cracking or breaking
  • Coloured through product
  • Weathers like slate not concrete
  • 25 Year Guarantee
  • FREE Samples Available
  • Manufactured to BSi Standards

“Creating Roofscapes of Distinction”

Westmorland Green Natural slate has been quarried for over 400 years to create a truly stunning roof covering, that is used throughout the British Isles. 

The slate provides an appearance of distinction that would grace any home, with its elegant green colour and is quintessentially British and speaks permanence.

Natural Slate is renowned for being quarried from Honister Slate Mine or Burlington Stone quarries located near Kirby–in–Furness within the Lake District National Park.

Due to demand overtaking supply and therefore increase in costs and availability of Westmorland Green Slates, Greys Artstone recognised that there would be a demand to provide a genuine alternative, that not only provides a cost saving of around 75% against the natural product, but also replicates identically the random diminishing course roofscape the Westmorland slate deserves, that is also readily available.  

Greys Artstone Reproduction slate provides an exquisite finish and provides an identical laid appearance to that of the natural product.

With moulds taken from Westmorland Green Natural Slate originals, the exquisite texture of the reproduction is as essential, as this surface creates the Westmorland Greens distinctive characteristics.

As specialists in manufacturing Random Diminishing Stone slates for the Yorkshire Dales National Park of over 25 years, we provide an easy to lay format to provide not only cost savings on the roofing slates but also in time and labour.

Advantages: Reproduction Westmorland Green Slates

  • Up to 75% Cost Saving of Natural Product
  • Product readily Available (no long lead times therefore no site delays)
  • Uniform thickness, No Sorting or Grading required by Building/Roofing Contractor, saving on time and labour
  • Designed to diminish, batten schedules provided 
  • Construction allows easy cutting without cracking or breaking
  • Coloured through product, Weathers like slate not concrete
  • Site visits / Sample slates on request


Available Colours and Sizes

greys artstone random diminishing slate colours

greys artstone random diminishing slate sizes

Weight 30kgm2

The light weight construction of our slates saves on labour and timber costs, approximately 33% with our slate products.


Our slates are constructed from Glassfibre Reinforced Concrete (GRC). Construction allows easy cutting without cracking or breaking. Our slates weather like natural slate not concrete, unlike aggregate based concrete products that can show aggregate through their surface due to weathering over time.

In a recent document The International Glassfibre Reinforced Concrete Association recommend that for good quality GRC, ductile lifetimes of at least 60-80 years can be confidently expected in UK weather conditions (Source: www.grca.org.uk).

Download GRCA information, British Standards Testing and Data Sheets. Here

Our standards speak for themselves

Our roofing products conform to the following BSi Standards ensuring maximum performance in the toughest conditions.

  • Fixings - to BS 5534:2003
  • Durability - to BS 7543:2003
  • Colour - to BS 1014
  • None combustible - to BS 476 P.T.4
  • Freeze / Thaw - to BS EN 492:2012
  • Strength - better than BS EN 492:2012
  • Permeability - to BS EN 492:2012

Our products are guaranteed

We’re confident our product is durable enough and manufactured to the highest of standards that we give a 25 year manufacturer guarantee.

Roof Pitch: Head Lap Specification

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Contact Details

Greys Artstone Limited
Burdwell Works
New Mill Road
West Yorkshire
Email Us
Telephone: +44(0)1484 666400
Fax: +44(0)1484 662709

General Information

FREE Site Survey
FREE Estimates
FREE Batten Layouts

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