Ventilated facades in clay, natural slate and wood


Ventilated facades in clay, natural slate and wood


Ventilated facades in clay, natural slate and wood


Production of Natural Slate

World class natural slate

Natural slate is a fine-grained, uniform metamorphic rock type, which is created by clay and volcanic ash. The slate consists primarily of quartz and muscovite, but it also contains biotite, chlorite, pyrite and hematite.

As opposed to many other materials for roofs and facades, natural slate has not been subject to an industrial process. The slate is cut directly from the rock and is then cut up. Then, it is hand-split with a hammer and chisel into suitable formats, which are then installed on roofs or facades. The hand-splitting with a hammer and chisel implies very limited energy in the production of the slate, and therefore, natural slate is regarded as one of the world’s most environmentally-friendly construction materials. If you have a quality natural slate roof, the durability of the natural slate can sometimes exceed the lifetime of the building itself. If the selection criteria for a new roof consist of being environmentally friendly and having no maintenance, there is no better choice.

There is no resource shortage for natural slate since very large, unexploited natural slate resources still exist. Slate is expected to exist for millions of years to come.


We produce our natural slate in Galicia, in the north-west part of Spain. In a small, geographically-limited mountain area near the down of O’Barco, you can find some of the world’s best deposits of natural slate. Natural slate can be found in slate veins going deep into the mountains, and this is where the raw and exclusive slate is broken down.

The history of slate 

Graves dating as far back as 600 BC have been found that were lined with slates, and the Romans made roads from slate tiles. However, it was first around the 1500s when people started using natural slate for roof construction in central Europe and in the Nordic countries. The advantage with slate compared to other roofing materials is that natural slate is stronger and cannot burn. Some interesting trivia is that the first Frederiksborg Castle, Koldinghus and Copenhagen Castle had natural slate on their roofs. Natural slate has an extremely low water absorption index of less than 0.4%, which means that it is extremely resistant to frost.

 In Denmark, natural slate was used extensively as a roofing material from the mid 1800s to the early 1900s, during which time all large buildings in the market towns, manors, villas etc. were built with slate roofing. After this follows a period with diminished use of natural slate, but the use of natural slate increased again at the beginning of the 1980s when it became one of the favoured materials. Currently, natural slate is used mostly as an exclusive roofing material, which allows the integration of solar cells in the roof. 


The manufacturing of slates follows centuries old traditions, and a large part of our natural slate is still split by hand today.


Natural slate is a natural, long-lasting and exclusive construction material, and at the same time, it’s properties are extremely well-suited to handle weather, wind and fire. The lifetime of natural slate is top-notch, exceeding 80 years.

See how slates are created

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Kim Kristensen

Position EN:
Project sale
Mobile: 2399 0310

Niels Heidtmann

Position EN:
Export director / partner
Mobile: 5077 0452
Order free sample

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