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Here you will find the most common questions related to natural slate and our selection of products.

Frequently Asked Questions – Roofing slates

What is natural slate?

Please, check this article about what is slate.

What is the age of slate?

The age varies depending on the regional geology. For example in Scotland, Ballachulish slate was formed from sediments laid down approximately 700 million years ago and was metamorphosed 500 million years ago, while Spanish slate from the Orense area was formed from muds laid down over 450 million years ago and was metamorphosed 300 – 350 million years ago.

What is the fire resistance of a natural slate?

Producers may indicate the reaction to fire of their materials, classified in accordance with the European standard EN 13501-1. CUPA PIZARRAS natural slates have been certified as A1, the best possible classification because they are non-combustible.

Conversely, manufacturers of fibre-cement slates were certified as A2, only “non-flammable”. 

What is the life expectancy of roof tiles?

Natural slate is the most durable roofing material. British geologist J.A. Walsh highlights that natural slates have a service life of greater than 100 years. After a detailed research, Walsh exposed natural slate (including CUPA 3) to different weather conditions. As a result, geologist emphasizes natural slate durability to last over a century.

How much does slate weight (weight per square meter)?

Please, check this article about what how to calculate the weight of slate.

What is the minimum headlap for fixing slates?

Please, check this article about what the minimum headlap for fixing slates.

Why choose natural slates for roofing?

Please, check this article about why choose natural slate for roofing.

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