RockDeck 20 – Exclusive terrace in Alta Quartzite

A terrace in genuine natural stone.

RockDeck 20 consists of Altaskifer decking boards with concealed fixings, designed to create an exclusive, low-maintenance and highly durable outdoor floor for Nordic climates.

RockDeck 20 is a modular decking system made from genuine Norwegian Altaskifer. The system is designed to provide an exclusive, solid and low-maintenance terrace with a natural stone surface and a long service life.

The decking boards are produced in a thickness of 20 mm and a width of 300 mm, with modular lengths of 300, 600, 900 and 1200 mm. The modular design ensures that all board ends are supported by a joist when installed on joists at 300 mm centres, providing a stable installation and efficient use of materials.

RockDeck 20 is installed using concealed fixing clips and a resilient layer of 1.5 mm EPDM between the stone and the joists. This contributes to stability, reduces stress on the structure and supports a long service life.

The quartzitic slate from Alta has very high strength, low water absorption and excellent frost resistance, making it ideal for Nordic climatic conditions. Its natural split surface creates an exclusive and timeless appearance.

RockDeck 20 is suitable for terraces, roof terraces, holiday homes and architectural outdoor spaces where quality, design and longevity are priorities. It offers a durable alternative to traditional decking materials for those seeking a natural stone terrace with minimal maintenance.

Product data

SpecificationDetailsMaterialNorwegian quartzitic slate from AltaThickness20 mmStandard width300 mmLengths300 / 600 / 900 / 1200 mmInstallationConcealed fixing clipsSubstructureJoists at 300 mm centresSeparation layer1.5 mm EPDM between the stone and the joistsJoint width6 mmOriginAlta, Norway

Benefits

Decking boards made from genuine Altaskifer
Modular system optimised for joists at 300 mm centres
Concealed fixings create clean lines and an exclusive appearance
Highly durable natural material with a long service life
Low water absorption and high frost resistance
Low-maintenance alternative to traditional timber decking
Natural surface with a timeless, exclusive character

RockDeck 20 vs traditional timber decking

RockDeck 20 gives you a genuine natural stone outdoor floor with a very long service life and minimal maintenance. While traditional timber decking often requires regular treatment, cleaning and replacement over time, Altaskifer offers natural wear resistance and an appearance that lasts year after year.

Slate is dimensionally stable, frost-resistant and robust, and is not affected by moisture, movement and wear in the same way as timber. For projects where quality, longevity and aesthetics are central, RockDeck 20 is a distinctive decking choice.

Why choose an Altaskifer terrace?

An Altaskifer terrace is a choice for those who want more than a traditional outdoor floor. Genuine natural stone offers an exclusive appearance, a natural surface and a level of durability that few other materials can match.

Altaskifer is known for its strength, low water absorption and excellent frost resistance. This makes it highly suitable for Norwegian conditions, whether used on private terraces, at holiday homes, on roof terraces or in public outdoor spaces.

With RockDeck 20, you get a terrace with a very long service life, minimal maintenance and a timeless appearance that lasts for many years. The result is a terrace that looks exclusive from day one and continues to do so long after many other materials need replacing.