Knauf FrameTherm Roll 35 - 140mm Glass Mineral Wool

140mm Knauf FrameTherm Roll 35 is a glass mineral wool roll designed for timber frame construction between studwork. With thermal conductivity of 0.032 to 0.040 W/mK, this 140mm insulation roll delivers excellent performance. Non-combustible and achieving the highest Euroclass A1 fire rating, it's manufactured with ECOSE® Technology bio-based binder for superior environmental credentials.

Product specification

• Thickness: 90mm
• Width: 1140mm (3 x 380mm)
• Length: 3900mm
• Roll Coverage: 4.45m2
• Pack Quantity: 2
• Density: 28kg/m3
• Weight/m2: 2.52kg
• Weight: 12.93kg
• Thermal Conductivity: 0.035W/mK
• R-Value: 4.0m2K/W
• Type: 140mm Glass Mineral Woll Insulation
• Application: Timber frame walls, Pitched roofs at rafter level
• Facing: Unfaced
• Roll Type: Ready-cut
• Fire Rating (Reaction to Fire): A1(Non-combustible)

Advantages

• Pre-cut rolls fit snugly between timber studs, creating an effective thermal barrier that stops air leakage and heat loss through the insulation layer.
• Available in two convenient pre-cut formats: 2x570mm or 3x380mm, matching standard timber stud spacing for easier installation.
• Mineral wool construction provides excellent sound absorption and acoustic performance, outperforming many conventional insulation alternatives.

Application

This 140mm Knauf FrameTherm 35 Roll suits external walls and warm pitched roofs in timber frame buildings. Timber frame construction typically outperforms masonry in thermal terms, but its lower mass means insulation materials must deliver enhanced acoustic properties to compensate. FrameTherm Roll 35 friction-fits between studs to minimise heat loss whilst providing acoustic absorption, boosting overall wall performance.

Real Performance

Glass and rock mineral wool installs more straightforwardly than rigid boards, adapting to substrate variations and creating seamless contact without air gaps. 140mm Mineral wool insulation accommodates surface irregularities and structural movement, maintaining close contact and thermal performance over the building's lifetime. Eliminating air gaps is essential for real-world performance. Insulation that fails to deliver genuine 'as-built' thermal performance compromises its core function and adds unnecessary risk as the construction sector closes the performance gap.

Info

Browse our full Knauf Insulation range and filter by thickness or coverage on the left. For product suitability advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee or use Live Chat - Knauf Mineral Wool Insulation at competitive UK prices.