Our Sales Team are always here to help.    For more information or advice on our Reproduction Slate Products please Call 01484 666400 or Email Us
  • greys artslate logo
    Reproduction Westmorland Green
    Roofing Slate

     Up to 75% Cost Saving of Natural Welsh Slate 

  • greys artslate logo
    Reproduction Westmorland Green
    Roofing Slate

     FREE Site Survey and FREE Slate Samples 

Reproduction Westmorland Green - 24”x12” Single Size Slate

Advantages of Reproduction Westmorland Green Slate

  • Up to 80% 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
  • Construction allows easy cutting without cracking or breaking
  • Coloured through product, Weathers like slate not concrete
  • Site visits / Sample slates on request
  • Available in Blue/Grey & Heather Purple Colours
  • manufactured in the ukManufactured in the UK
Random Diminishing Welsh Slate

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Reproduction Random Diminishing Westmorland Green Slate

View Diminishing Westmorland Green Slate

Greys Roofing Reproduction Westmorland Green Slate is a high quality alternative to Natural Burlington and Honistor Slate

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, 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 an increase in costs and availability of Westmorland Green Slates, Greys 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 roofscape the Westmorland slate deserves and is also readily available. Greys Reproduction Slate provides an exquisite finish and gives 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 essential, as this surface creates the Westmorland Greens distinctive characteristics. As specialists in manufacturing Random Diminishing Stone slates for the Yorkshire Dales National Park for 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.

The texture of our Reproduction Westmorland Green Slates are taken from natural slate originals, providing a surface even at close proximity is difficult to distinguish from the quarried product.
Combining this with a roofing slate that requires no sorting or grading, therefore saving on, on site time and labour, it is a true practical alternative. A slate that truly provides a blend of quality and aesthetics.
The fine edge detail and textured surface combines with realistic colouration to create an attractive alternative to natural slate. 
Greys reproduction roofing slates have been designed in consultation with professional roofers and architects, to achieve an easy to lay and uniform slating format. 
Greys Artslate Roofing Slates are constructed from Glassfibre Reinforced Concrete (GRC) producing a strong and durable slate weighing only 30kgm2
Their construction allows them to be cut easily without cracking or breaking and looks like slate when cut.


Westmorland Green



Greys Artstone Stone Slate Size

Reproduction Welsh Slate Technical Data

Our standards speak for themselves

  • Weight - 30kgm2
  • Construction - Glass Fibre Reinforced Cement
  • Fixings - Copper or Aluminium alloy nails to BS 5534:2003 codes of practice for slating and tiling
  • Durability - To BS 7543: 1992, '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
  • Freeze / Thaw - Products comply to BS EN 492:2012
  • Strength - Better than BS EN 492:2012
  • Permeability - To BS EN 492:2012
  • Ventilation - Net free ventilation area - Slate 10,000mm2, Ridge gives 12,500mm2, for 5mm continous air gap install every 2.5m

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

  • 3” Overlap – Roof pitches between 28 degrees and above.
    Please seek advice regarding severe exposure of roof

  • 4” Overlap – Roof pitches between 27 degrees and 20 degrees (Double felting and boarding recommended depending on roof exposure at minimum pitches)

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 24" x 12" Reproduction Slate Brochure

Read eBrochure

Download Greys Artstone 24" x 12" Reproduction Slate Brochure

Read eBrochure

Greys FREE Slate Samples
hbr building logo show 2018 concept 217x90 no sponsor
21 - 24 March 2024
1 - 3 November 2024



  • Contact Details
    Greys Artstone Limited
    Lees Mill
    Lees Mill Lane
    HD7 5QE
    Telephone: +44(0)1484 666400
    Fax: +44(0)1484 662709

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