Canadian Glendyne Preholed Natural Roof Slates 20 inch x 10 inch 500mm x 250mm

( £3.90 Incl. VAT)
  • Buy 1000 for £3.15
    ( £3.78 ) each and save 3%
  • Buy 1500 for £3.05
    ( £3.66 ) each and save 6%
Availability: In stock
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Pricing & Availability:

The pricing on this product is applicable to deliveries made to sites within the locality of our branches (which is broadly Surrey, Sussex, London and parts of Kent, Hampshire & Berkshire).

For pricing and availability on these products to sites that are outside of our local area please contact us directly so that we can explore the most cost effective options for you.

We also stock and supply a large range of roofing materials, with thousands more being available to order directly from all the leading manufacturers. If you don't see the roofing products that you need on this site please contact us and we will try to source them for you or offer you an alternative.

We are able to offer prices tailored to your exact requirements & project: Please call us on 01737 763008 or email us for a free quotation.



Canadian Glendyne Preholed Natural Roof Slates 20 inch x 10 inch 500mm x 250mm

Glendyne Canadian slate is produced in the town of Saint Marc du Lac Long, Quebec, Canada.

Produced from deposits laid down in the Ordovician era some 500 million years ago this quarry was first opened by British slate quarrymen in the early part of the 20th century.

Roofs with Glendyne slate can still be seen today around the area of the quarries, some 90 years later.

These are a good match for Ffestiniog or other blue/grey British natural slate offering consistent high quality, high strength & minimal unstable mineral content.

Glendyne slate has a reputation for quality due to the exceptional slate deposit and the combination of modern extraction methods with traditional finishing skills.



  • Thickness: 4 - 5mm (approx)
  • Type: Preholed


  • Glendyne slate will withstand the most severe weather conditions
  • Not affected by sunlight, ultraviolet light and even acid rain
  • Laid correctly Glendyne slate will last the lifetime of the building and is ideal for use on any major project including supermarkets, schools, city offices and prestige homes
  • Supplied preholed


  • Slates should be twice centrenailed to horizontal battens etc., as described in BS 5534, using copper, aluminium, phosphor or silicon bronze nails to BS 5534: 2003
  • The minimum head diameter for nails used with natural slates is 10mm (which generally means a shank diameter of between 3.00 - 3.35mm) and they should penetrate into the batten by a minimum of 15mm
  • Slates, generally, should be not less than 150mm wide
  • At all verges and abutments, alternate slate courses must start with half width or slate and half width to maintain bond.
  • Slate and a half widths must be used if the half slate is less than 150mm wide
  • At valleys and hips where slates need to be cut on the rake, wide slates must be used to maintain an adequate width at the head or tail
  • At mitred hips on low pitched roofs wide slates should be used beneath the hip capping.
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