Expanded shale is an industrially manufactured lightweight aggregate produced from natural roofing slate from the nearby Raumland Böhl quarry. Wittgenstein roofing slate is geologically classified as coming from the Rhenisch Slate Mountains and was formed around 380 million years ago. This raw material contains organic components as the sedimentary rock and has a very similar composition to clay. This is one of the reasons why it is also known as shale. Originally, tailing ponds from roofing slate production were used as a raw material for manufacturing expanded shale.

Business activity

Keywords associated with this company

Marble and natural stones /  Landscaping contractors /  Concrete aggregates /  Lightweight aggregates for concrete /  Dry screed /  Roof greening material /  Concrete repair /  Expanded shale /  Plant substrate for rooftop gardens /  Filter media /  Surface greening material /  Rooftop greening material /  Rooftop greening /  Lightweight aggregates for concrete /  Gardening and landscaping /  Rooftop grassing /  Natural stonework /  schist / 

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Additional details

Key figures

  • company headcount
    11 – 50


  • Site status
    Registered office, Parent company
  • Main activity
    Manufacturer/ Producer

Markets and trading zones

  • Trading areas
    Regional  -  National  -  European  -  International

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