Glass Mineral Wool - Earthwool Loft Roll 40


Pitched roofs at ceiling level


Glass Mineral Wool


Earthwool Loft Roll 40 provides a superior performance with a thermal conductivity of 0.040 W/mK.

Available with partially cut perforations, Combi-cut has the flexibility to be used between joists at either 400mm or 600mm centres, or used unsplit as a full-width roll.


  • Euroclass A1 non-combustible
  • Superior thermal performance
  • Lightweight quilt for ease of installation.
  • Available as:
    • Partially cut rolls for use with:
      • timber joists at 400mm centres or,
      • timber joists at 600mm centres or,
      • unsplit as a full width roll.



Thickness (mm)Roll TypeThermal Conductivity (W/mK)R-Value (M²K/W)Euroclass Reaction to Fire ClassificationLength (mm)Width (mm)Area per roll (m²)Quantity Per PackArea Per Pack (M²)Packs Per PalletArea Per Pallet (m²)
100Combi-cut0.0402.5A1112501140 (2 x 5700mm/3 x 380mm)12.83112.8324307.92
150Combi-cut0.0403.75A175301140 (2 x 5700mm/3 x 380mm)8.5818.5824205.92
200Combi-cut0.0405A148501140 (2 x 5700mm/3 x 380mm)5.5315.5324132.72


Eurofins Gold
A1 Euroclass Fire Rating
Green Guide Rating A+
CE Marking
Bureau Veritas

Declaration of Performance

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Additional Product Information

ECOSE® Technology

ECOSE® Technology is our revolutionary sustainable bio-based binder used in the manufacture of all of our glass mineral wool products, and the majority of our rock mineral wool products. invented nearly 10 years ago, it is not only unique, but very much central to our sustainability strategy.  Our ECOSE® Technology is present in Earthwool Loft Roll 40 and is just another key benefit of our products.

ECOSE® Technology has 5 key benefits

  • A natural binder
  • A lower embodied energy
  • Proven durability
  • Optimum indoor air comfort
  • Easy to handle

We care for the people who make our products, the people who use them and the world we all depend on.

 Whilst we are dedicated to supplying sustainable high performance insulation solutions for enhanced energy efficiency in buildings, we also continually strive for improvements in our manufacturing and supply chain operations so to improve quality and minimise our impact on the environment. All Knauf Insulation production locations have state-of-the-art manufacturing equipment and meet the highest quality standards as well as they are supported by an ongoing research and development program. All of our products including Earthwool Loft Roll 40 are sustainably manufactured.

At Knauf Insulation, we have 7 key sustainability considerations:

  • to conserve natural resources
  • to reduce the evironmental effects of our own processes
  • Treating people fairly, along the supply chain
  • Delivering our products efficiently
  • Building a comfortable and healthy indoor environment
  • Performance reporting
  • Recognition