Glass Mineral Wool - Knauf Insulation Loft Roll 40

Knauf Insulation Loft Roll 40


Pitched roofs at ceiling level


Glass Mineral Wool


Knauf Insulation Loft Roll 40 is a Glass Mineral Wool roll, designed for use in cold lofts where pitched roofs are insulated at ceiling level, that offers the best thermal performance in the range.

It is non-combustible insulation with the best possible Euroclass A1 reaction to fire classification, and is manufactured using Knauf Insulation's unique bio-based binder, ECOSE® Technology.


  • Combi-cut products are supplied partially perforated, providing the flexibility to be used between joists or used uncut as a full-width roll, maximising on-site efficiency.
  • Manufactured in long lengths to allow quick and simple installation maximising on-site efficiency.
  • Compression packed and lightweight for easy handling and moving around a site.



Thickness (mm)Length (mm)Width (mm)Thermal Conductivity (W/mK)R-Value (M²K/W)Area per Roll (m²)Euroclass Reaction to Fire ClassificationRoll TypeFacing
100112501140 (2 x 570mm/3 x 380mm)0.0402.512.830A1Combi-cutUnfaced
15075301140 (2 x 570mm/3 x 380mm)0.0403.758.580A1Combi-cutUnfaced
20048501140 (2 x 570mm/3 x 380mm)0.04055.530A1Combi-cutUnfaced

Certification & Memberships

Eurofins Gold
Euroclass A1 Reaction to Fire Classification
Green Guide Rating A+
CE Marking
Red List Free
EN 15804
Made in Britain

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