Specialists in Reproduction Conservation Roofing

Reproduction Slate Technical

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 and weather over time.

Example of GRC Construction versus none GRC Construction

GRC v none GRC construction

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).

Sizes and Ancillary

Slate Sizes and Ancillary Products

Dry Ridge Systems and Velux kits are available for our Reproduction Slates

See full range of ancillary products

Technical Specification

  • 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


  • 3” Overlap – Roof pitches between 28 degrees and above
  • 4” Overlap – Roof pitches between 27 degrees and 20 degrees (Double felting and boarding recommended depending on roof exposure at minimum pitches)


Slate Technical Data Sheet
PDF Download Slate Technical Data (210k pdf document)

PDF Download 3" Headlap Batten Layout (650k pdf document)
PDF Download 4" Headlap Batten Layout (650k pdf document)

Durability of Glass Reinforced Concrete
PDF Download Durability of GRC (1.7Mb pdf document)

Documents require Adobe Reader you can download a copy HERE

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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.

Reproduction Slate Gallery

Reproduction Slate

manufactured in the ukManufactured in the UK

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

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The tensile strength that results from glass reinforced cement construction allows the slates to be cut easily, without cracking or breaking and offers a 33% saving in weight compared with the natural equivalent.

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

Artificial Stone Slate Range


  • NO cutting, NO grading
  • Weight 30kgm2
  • Sizes 600mm x 300mm (24”x12”)
  • Indented to facilitate either 75mm or 100mm headlap
  • Under eaves and under ridge slates (no cutting)
  • Slate and a half available
  • Uniform Size
  • 25 Year Guarantee
  • FREE Samples Available
  • Manufactured to BSi Standards

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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