Diminishing Reproduction
Westmorland Green Slate

 manufactured in the ukManufactured in the UK

greys artslate logoWestmorland 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.

  • Reproduction Random Diminishing 'AGED' Westmorland Green Slate

    Reproduction Random Diminishing 'AGED' Westmorland Green Slate

  • Greys Reproduction Random Diminishing Westmorland Green Slate

    Reproduction Random Diminishing Westmorland Green Slate

  • Reproduction Random Diminishing 'AGED' Westmorland Green Slate

  • Reproduction Random Diminishing 'AGED' Westmorland Green Slate
  • Greys Reproduction Random Diminishing Westmorland Green Slate

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.

Designed to Diminish

Our slates are designed to give a random diminished course roofscape. A wide range of sizes ensure the roof can be laid using a random diminishing course technique providing greater weather protection and an authentic look.


  • 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 in New Quarried or Aged Colours
  • Manufactured in the UK


New Quarried Westmorland Green


Aged Westmorland Green


Greys Artslate Random Diminishing Slate Size

Westmorland Green Reproduction Slate Technical Data

Our standards speak for themselves

  • Weight - 30kgm2
  • Construction - Glass Fibre Reinforced Cement
  • Fixings - 35mm Copper or Aluminium alloy nails to BS 5534:2003 codes of practice for slating and tiling
  • Durability - To BS 7543:2003, ‘The durability of building and building elements, products and components’
  • Colour - Coloured through with pigments to BS 1014
  • Fire - None combustible to BS 476 P.T.4
  • Approved for Conservation Areas, National Parks and Grade 2 Listed Buildings
  • Freeze / Thaw - Products comply to BS EN 492:2012
  • Strength - Better than BS EN 492:2-12
  • Permeability - To BS EN 492:2012

All the slates in our range have been successfully tested for durability, colour, strength, fire and freeze thaw. Many of our competitors use traditional concrete, their slates aren’t protected from the elements, which will expose the aggregate over time. See the example below.

Example of GRC Construction versus none GRC Construction.
Greys GRC Slate

Weathers like a natural stone or slate product

Aggregate Concrete Slate

Weathers and shows aggregate over time

  • Greys GRC Slate

    Weathers like a natural stone or slate product

  • Aggregate Concrete Slate

    Weathers and shows aggregate 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).

Roof Pitch Headlap Specification

  • Job Specific - Batten Shedule Provided

Ridges and Ventilation Systems

Greys Artstone Reproduction Stone Ridge

Repro Stone Slate Ridge

Repro Stone Vent Ridge

Legged Angled Slate Ridge

Slate Ridges

Reproduction Vent Slate

Greys Artstone Vent Slate

Dry Ridge System


Our Green Credentials:

Greys Roofing Products are manufactured using CEM 2 Cement that contains 30% Fly Ash (Fly Ash is the correct term as appears in European and British Standards and has replaced “pfa”) Pulverised Fly Ash (pfa) is a waste product of pulverised fuel (typically coal) from fired power stations.

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.

greys 25 year guarantee icongreys bsen icongreys ce icongreys free site survey icongreys free estimates icongreys free batten layout icongreys supply and fit icon

Colour and Efflorescence COLOUR: Stone and Slate colours on this website are subject to the limitations of monitor quality and are for guidance only. EFFLORESCENCE: The phenomenon of efflorescence has been a problem to the construction industry for decades. The cause lies in the basis chemistry of all Portland cements. Efflorescence in Greys Artstone products is a temporary phenomena and will disappear over time.

Download Greys Artstone Reproduction Stone Brochure

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Greys FREE Slate Samples
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5 - 7 November 2021