Rockwool Flexi Slab 1.2m x 400mm

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  • Size of rolls: 400 x 1200mm
  • Excellent thermal, acoustic and fire insulation
  • Suitable for application between timber and steel frames
  • Non-combustible
  • Water repellent
  • Patented flexible edge
  • Rockwool Flexi Slabs are sold per pallet

Rockwool Flexi Slab (Pallet)

Rockwool Flexi Slabs are intended for a wide range of building applications. It is a multi-use, dual-purpose acoustic and thermal mineral wool insulation slab with a flexible edge along one side which ensures a perfect fit is maintained between the insulation and the supporting framework. This patented technology helps to prevent insulation shrinkage, thereby significantly reducing cold spots. The insulation can be fitted between fresh timber and will expand into the wider space as the timber shrinks back. 

Rockwool products achieve a Euroclass A1 classification for non-combustibility. The safest insulation material on the market, Rockwool Flexi Slabs actively prevent the spread of flames in the event of a fire. Flexi Slabs offer all-round performance with their robust form and water repellent qualities. They are also very easy to handle and install.

Technical specification

  • Composition: mineral wool
  • Thermal conductivity: 0.035W/mK
  • Reaction to fire: Euroclass A1
  • Size of rolls: 400 x 1200mm
  • Thicknesses available: 50mm, 75mm, 90mm, 100mm, 140mm


Rockwool Flexi Slab should be installed in accordance with the manufacturer’s installation guidelines – these should cover design and all aspects of the application of the insulation. 


Shelf life: please see the manufacturer’s date of expiry. Keep in a dry place, in the original packaging. Avoid excess heat or UV light exposure.


50mm – 138.24m2, 100mm – 86.4m2, 140mm – 46.08m2


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