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High performance glass mineral wool 'slab on a roll' insulation for use in pitched roof rafter applications 0.034 W/m·K. It also provides an acoustic solution to reduce externally-generated airborne noise by 49 dB (RW).

Features and benefits:

  • Easy to install and handle.
  • Friction fit between the rafters, eliminating air gaps.
  • Available in a range of thicknesses to suit a variety of rafter depths.


Resilient to moisture damage in storage, during transportation and on site during installation.


  • All Isover products are manufactured under Environmental Management System – ISO 14001.
  • Zero Ozone Depletion Potential (ODP), Global Warming Potential (GWP) <5.
  • The manufacturing process does not use or contain CFC's, HCFC's or other damaging gases.


All Isover products are manufactured under Quality Management Standard – ISO 9001.

Recycled content:

Isover glass mineral wool insulation is manufactured from up to 80% recycled glass.


  • Made from rot-proof non-hygroscopic materials.
  • Will not sustain vermin, nor breed or promote fungi or bacteria.

Handling and storage:

Isover products are supplied fully palletised:

  • Weatherproof packaging for outside storage.
  • Reduced haulage costs.
  • Less handling therefore less damage.
  • Reduced storage space.
  • Packs remain clean and in good condition.
  • Faster loading, unloading and counting.

General information
Specification data - Mineral wool insulation
Product Reference

Isover Metac


50 mm

9.3 m roll length x 1200 mm width.

125 mm

4.8 m roll length x 1200 mm width.

150 mm

4.1 m roll length x 1200 mm width.

175 mm

3.5 m roll length x 1200 mm width.

200 mm

3.2 m roll length x 1200 mm width.

Standard product features

Thermal conductivity:

0.034 W/m·K.

Fire resistance:

Euroclass A1 fire rating when classified to BS EN 13501-1.

Third party certifications
  • Manufactured according to EN ISO 9001 AND 14001: Certificate numbers 691/15
  • CE marked: to BS EN 13162 (1121-CPA-BA0053)
  • BRE Global Green Guide: generic rating A+
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