Knauf Earthwool 150mm Loft Roll 40 Combi Cut

150mm Knauf Earthwool Insulation Loft Roll 40 is a Glass Mineral Wool roll engineered for cold loft spaces where pitched roofs need insulation installed at ceiling height. This 150mm loft insulation provides excellent thermal performance across its rated thickness range.

Built with non-combustible insulation technology, the 150mm Knauf Loft Roll 40 achieves Euroclass A1 fire classification. The product is manufactured using Knauf Insulation proprietary bio-based binder system, ECOSE® Technology.

Product specification

Brand: Knauf®

Model: 150mm Knauf Loft Roll 40

Thickness: 150mm

Length: 85840mm

Width: 1140mm (2x570 3x380)

Dimensions: 8,5840mm x 1,140mm x 150mm

Pack Coverage: 8.58m2

Material: Glass Mineral Wool

Profile: Combi-Cut | 2x570mm | 3x380mm

Facing: Unfaced

R-Value: 3.75m2K/W

Thermal Conductivity: 0.040 W/mK

Fire Classification: Euroclass A1

Vapour Resistivity: 5.00MNs/g.m

Applications: Pitched roof at ceiling level

ECOSE Technology: Yes

Features: Quick and simple installation

Manufacturer: Knauf Insulation Earthwool®

150mm Knauf Loft insulation Roll 40 is available in the following formats:

• Combi-cut rolls
• Ready-cut rolls
• Uncut rolls
• Short length, combi-cut rolls

ADVANTAGES

1. Lightweight and compressed for convenient site handling and transport.
2. Combi-cut variants arrive partially perforated, giving you the choice to fit between joists or use as a full-width roll, boosting installation speed.
3. Ready-cut variants come pre-sized for immediate use, reducing on-site preparation time.
4. Uncut variants allow full customisation, fitting between joists or laying as complete-width rolls for rapid installation.
5. Extended roll lengths enable fast, hassle-free installation and maximise site productivity (Combi-cut, ready-cut, and uncut options).
6. Shorter roll lengths deliver a budget-friendly solution in smaller pack quantities, particularly for short-length Combi-cut variants.

Application

150mm Loft Rolls provide thermal insulation for cold pitched roofs at ceiling level. Installation typically involves laying two layers—the first between joists and the second perpendicular across the joists.

Sizes:

Management, Cutting, and Storage Guidelines:

• 150mm Knauf Loft Roll 40 is straightforward to manage thanks to its light weight and simple installation process. Cutting to size is quick and uncomplicated.
• The 150mm Loft Insulation Rolls come wrapped in recyclable polythene (4-LDPE) for short-term site protection.
• For longer-term on-site storage, keep the product indoors or under cover, positioned above ground level.
• Avoid leaving Loft Rolls exposed to the elements for extended periods.

About

Our 150mm Glass Mineral Wool insulation range contains up to 80% recycled content. By maximising the use of recycled glass in manufacturing, we reduce demand for virgin materials.

Thermal

The 150mm insulation delivers energy-saving benefits and thermal efficiency, keeping buildings warm during winter and cool in summer. Greater temperature differences between inside and outside accelerate heat loss in winter and heat gain in summer. Our 150mm Knauf mineral wool insulation works to maintain steady indoor temperatures by resisting heat transfer via convection, conduction, and radiation. Effective insulation reduces heating demands in cold months and air conditioning requirements in warm months, delivering substantial energy savings.

Fire Safety

The 150mm loft insulation provides passive fire protection capabilities. Buildings must be designed and constructed to minimise fire risk, limit spread, maintain structural integrity, and enable safe evacuation. Our non-combustible mineral wool insulation acts as a fire barrier and does not fuel fire progression, reducing overall impact and severity.

Acoustic

Insulation acoustics significantly improve the internal environment for building occupants. Noise control enhances quality of life in homes and creates healthier, more productive spaces in offices, hospitals, schools, and commercial buildings. Our 150mm Knauf mineral wool insulation rolls deliver strong sound absorption and noise reduction in new builds and retrofit projects, resulting in superior sound insulation and acoustic comfort.

Info

Browse our full Knauf Insulation range and filter by thickness or coverage using the left-hand menu. For product suitability advice or bulk quotations, contact us on +4402039519012 , email sales@insulationbee.co.uk or use Live Chat for the best UK Knauf Loft Insulation prices.