R 11
0.1 weight%
1.36 CO₂-EQ
46.2 MPa
A natural, gently wavy and highly light-reflective surface in a deep grey tone.
The slate is extracted from a large deposit in the bedrock between Rönnöfors and Finnsäter, near the Norwegian-Swedish border. The natural surface is created when the stone block is split by hand along natural layering without further treatment. All subsequent processing of format and thickness takes place locally at the quarry, ensuring consistent quality and a minimal climate footprint.
| min – max (mm) | min – max (mm) | min – max (mm) | |
| Length | Width | Thickness | |
| Rectangular, random lengths | 300 – 2500 | 100 – 1000 | 8 – 80 |
| Rectangular, fixed lengths | 300 – 2500 | 100 – 1000 | 8 – 80 |
| Square | 100 – 1000 | 100 – 1000 | 8 – 80 |
| Irregular | 400 – 2000 | 250 – 1500 | 5 – 130 |
| Wall bricks | 150 – 1500 | 25 – 450 | 25 – 200 |
| Natural edge | |
| Hewn | |
| Scissored | |
| Sawn | |
| Brushed | |
| Honed |
| Tiles for walls and floors (indoors) | |
| Tiles (paving) outdoors | |
| Outdoor tiles | |
| Outdoor tiles for raised flooring (pedestals) | |
| Flagstones | |
| Tråkkheller | |
| Stepping stones | |
| Stair treads | |
| Steps | |
| Massive terrain steps | |
| Countertops and slabs | |
| Wall bricks | |
| Wall bricks natural (dry wall) | |
| Machine stone (slate blocks) | |
| Facade panels | |
| Window sills |
| mm | |
| Thickness/depth (mm) | |
| Indoor floors/walls | 8 – 20 |
| Pedestal flooring indoor/outdoor | 20 – 25 |
| Floors (paving) outdoors | 10 – 80 |
| Pedestrian traffic | 10 – 30 |
| Light vehicles | 20 – 60 |
| Heavy vehicles | 40 – 80 |
| Roof | 8 – 35 |
| acade panels | 8 – 35 |
| Glued to steel/aluminium profiles | 8 – 12 |
| Slate overlap w/ screws or hooks on steel/aluminium/wood battens | 8 – 12 |
| Mechanically fastened on backside to profiles | 15 – 35 |
| Mechanically fastened with anchors in slate edge to profiles | 30 – 45 |
| Slate brick facades | Dybde |
| Dry wall/rough stone – small bricks | 50 – 200 |
| Dry wall/rough stone – large bricks | 150 – 300 |
| Thickness [mm] | Weight per m² [kg] |
| 10 | 27 |
| 12 | 32,5 |
| 15 | 40,5 |
| 20 | 54 |
| 25 | 67,5 |
| 30 | 81 |
| 40 | 108 |
| 50 | 135 |
| 60 | 162 |
| 10 – 20 | 50 |
| 20 – 30 | 67,5 |
| 30 – 40 | 100 |
| 40 – 60 | 135 |
| 60 – 80 | 190 |
| Minera wall bricks natural (dry wall), depth 50 – 200 | 400 |
| Minera wall bricks natural (dry wall), depth 150 – 300 | 500 |
| Density | 2740 g/m3 |
| Water absorption [by weight-%] | 0,11 |
| Flexural strength [MPa] | 46,2 |
| Slip resistance | R11 |
| CO₂ emissions [kg CO₂ eq/m², thickness: 12 mm] | 1,36 |
| The mineral composition explains the performance and homogeneity of Offerdal quartzite slate. This is a fine-grained quartzite slate with high mica content and low porosity, providing dimensional stability and durability. | |
| Quartz | 41% |
| Provides high wear resistance and low water absorption. | |
| Mica | 40% |
| Affects cleavage and surface; gives a homogeneous, fine-grained appearance. | |
| Feldspar | 8% |
| Contributes to colour tones and increases chemical stability. | |
| Epidot | 8% |
| Present in the surface together with quartz and mica, contributing to the slate’s dense and fine-grained structure. The mineral has no measurable effect on performance, durability or visual appearance. | |
| Opaque minerals (oxides/sulfides) | 1,8% |
| No practical significance for the slate’s appearance or technical properties. | |
| Other (calcite, titanite) | 1,6% |
| A composite group of minor components. The quantity is low and has no measurable impact on function or performance. |
| Petrography: | |
| Quartzite slate | |
| Place of origin: | |
| Offerdal, Krokom municipality, Sweden | |
| Descriptions of material for facades and flooring, indoor and outdoor: | |
| Medium grey quartzite in natural stratifications that provide a natural surface equivalent to Offerdal quartzite from Finnsäter. | |
| Splitable natural stone with distinct layers or zones showing different colour shades. | |
| Some variation in grey tones from slab to slab (or brick to brick) is desirable to create a vibrant, natural appearance. | |
| Flexural strength above 45 MPa | |
| Water absorption max 0.1 percent | |
| Slip resistance equivalent to minimum R11 | |
| Durable and long-lasting | |
| Long-term supply security and documentation requirements: | |
| EPD for assessment of life cycle analyses and CO₂ calculations | |
| Documented history showing that technical qualities are retained over time / not degraded despite the development of patina | |
| Potential for reuse (provided the functional specification otherwise allows it) | |
| Long-term maintenance plans | |
| Future availability of the same visual appearance and technical qualities | |
| Established routines for testing and quality control | |
| CE marked | |
| Reference projects | |
| Access to technical support and advisor | |
| Other material requirements: | |
| Must be a material of natural origin | |
| Material should reflect the project’s history and/or location | |
| See reference projects for desired visual expression |
Place of origin Offerdal in Krokom municipality, Sweden Petrography Quartzite slate
Offerdal natural surface: Light grey quartzite slate in natural layering providing a natural surface equivalent to Offerdal slate from Finnsäter.
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