140mm Knauf FrameTherm Roll 40 Glass Mineral Wool

140mm Knauf FrameTherm Roll 40 is a glass mineral wool roll designed for timber frame construction applications, fitting snugly between timber studs. With thermal conductivity values between 0.032 W/mK and 0.040 W/mK, this product delivers reliable thermal performance. These rolls feature a non-combustible composition and achieve the highest Euroclass A1 fire rating, manufactured with our innovative ECOSE® Technology bio-based binder.

Product specification

• Thickness: 140mm
• Width: 1140mm (2 x 570mm)
• Length: 8020mm
• Roll Coverage: 9.14m2
• Pack Quantity: 2
• Density: 28kg/m3
• Weight/m2: 2.52kg
• Weight: 12.93kg
• Thermal Conductivity: 0.040W/mK
• R-Value: 3.50m2K/W
• Type: 140mm Glass Mineral Wool 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

• Engineered to fit snugly between timber studs, creating an effective barrier that stops air movement and prevents heat loss through gaps in the insulation.
• Pre-cut rolls available in 2x570mm or 3x380mm widths to match standard timber stud spacing requirements.
• Mineral wool construction provides excellent sound absorption and acoustic performance, outperforming many alternative insulation materials.

Application

This 140mm Knauf FrameTherm 40 Roll suits insulating external walls and warm pitched roofs in timber frame buildings. Timber frame construction generally provides better thermal performance than equivalent masonry solutions. However, because timber walls have lower mass, they benefit from specialist insulation that delivers enhanced acoustic properties to compensate. This FrameTherm roll friction-fits between studs to reduce heat loss whilst simultaneously improving acoustic absorption, creating a more comfortable internal environment.

Real Performance

Glass and mineral wool insulation offers simpler installation than rigid board alternatives. The material flexes to accommodate minor surface irregularities and fits snugly without leaving air gaps. This 140mm mineral wool roll adapts to substrate variations and building movement, maintaining consistent contact and preserving thermal effectiveness throughout the building's lifetime. Eliminating air gaps is essential for achieving genuine thermal performance in practice. Any insulation that fails to deliver real 'as-built' performance undermines its core function and creates unnecessary risk as the construction sector works to bridge the performance gap.

Info

Browse our full Knauf Insulation range and use the left-hand filters to search by thickness or coverage. For advice on product suitability for your project or to request a quantity discount quotation, contact us on +4402038839057 , email sales@insulationbee or use Live Chat - Lowest UK Knauf Mineral Wool Insulation Prices.