Celotex Isover

ISOVER Timber Frame Roll 40

ISOVER Timber Frame Roll 40 is a glass mineral wool roll providing thermal performance and acoustic benefits in timber frame walls. Supplied in a range of thicknesses, the strong, resilient and flexible rolls are pre-cut to 2 x 570mm widths to fit between standard 600mm stud centres. It can also be used as the insulation between the joists in flat roofs.

Product Image
U-value Calculator
Start your U-value calculation >
Use the calculator


  • Timber Frame External Walls – Between The Studs
  • Timber Frame Internal Walls – Between The Studs
  • Timber Frame Separating Party Walls – Between The Studs
  • Flat Roofs - Between The Joists

Product Features

  • 2 x 570mm wide ready cut glass mineral wool rolls
  • Manufactured from up to 75% recycled content
  • Achieves an A+ generic rating within the BRE Global Green Guide
  • Achieves Eurofins Gold certification, the highest accreditation for indoor air quality

Product Properties

  • Board / Roll size: Width 2x570mm, Length 6500-10130mm
  • Thickness : 90-140mm
  • Material: Glass mineral wool

Product Performance

  • Lambda: 0.040 W/m.K
  • Reaction to Fire: Euroclass A1 Reaction to Fire classification according to EN 13501-1

Product Benefits

  • Helps to reduce heat loss within the building envelope and decrease energy costs.
  • Reduces the transmission of airborne sound, helping to improve the acoustic comfort of those living or working within the building
  • Non-combustible – achieves Euroclass A1 Reaction to Fire classification
  • Easy to install – push fits between 600mm timber stud centres with no need for cutting or additional fixings
  • Any off-cuts can be reused, minimising waste