Knauf 150mm Loft Roll 44 Combi-Cut Glass Mineral Wool Insulation 9.18m²
Knauf 150mm Loft Roll 44 Combi-Cut is a non-combustible glass mineral wool insulation roll designed for insulating cold pitched roofs at ceiling level. Ideal for loft insulation projects, the 150mm roll provides reliable thermal performance with a declared thermal conductivity of 0.044 W/mK and a thermal resistance of 3.40m²K/W.
Each roll covers approximately 9.18m² and measures 8050x1140x150mm. The Combi-Cut design is partially perforated, allowing the 1140mm-wide insulation to be split into 2 x 570mm or 3 x 380mm widths for efficient fitting between common joist centres, or used uncut as a full-width roll where required.
Key Features & Benefits - Knauf 150mm Loft Roll 44 Combi-Cut
- Manufacturer: Knauf Insulation
- Product: Loft Roll 44 Combi-Cut
- Material: Glass Mineral Wool
- Thickness: 150mm
- Roll size: 8050x1140x150mm
- Coverage: approximately 9.18m² per roll
- Thermal conductivity: 0.044 W/mK
- Thermal resistance: 3.40m²K/W
- Reaction to fire: Euroclass A1 - non-combustible
- Combi-Cut widths: 2 x 570mm or 3 x 380mm
- Application: Cold pitched roofs at ceiling level / loft insulation
- Technology: Manufactured using ECOSE® Technology
- Manufacturer product code: 2404155
- EAN / GTIN: 5012061815702
- Partially perforated for flexible installation
- Can be installed between joists or used uncut at full width
- Suitable for new loft insulation and topping up existing insulation where specified
150mm Loft Insulation for Cold Pitched Roofs
Knauf Loft Roll 44 is specifically designed for insulating cold pitched roofs at ceiling level, making it an ideal choice for domestic loft insulation projects.
Installing insulation at ceiling level helps reduce heat loss from the heated rooms below into the unheated loft space, improving the thermal performance of the building when installed as part of a correctly designed insulation system.
9.18m² Coverage Per Roll
Each 150mm Knauf Loft Roll 44 covers approximately 9.18m², making it easy to calculate the number of rolls required for your loft project.
The roll measures approximately 8.05m long x 1.14m wide before being split along the Combi-Cut perforations.
When calculating the quantity required, allow for the size and layout of the loft, obstructions and any cutting or wastage that may occur during installation.
What Does Combi-Cut Mean?
Knauf Combi-Cut insulation rolls are partially perforated across their width, allowing installers to select the most suitable width for the joist spacing being insulated.
The 1140mm-wide roll can be divided into:
- 2 x 570mm widths
- 3 x 380mm widths
Alternatively, the roll can be left uncut and installed at its full 1140mm width where appropriate.
This flexible format helps reduce unnecessary cutting and can make installation quicker and more efficient.
0.044 W/mK Thermal Conductivity
Knauf Loft Roll 44 has a declared thermal conductivity of 0.044 W/mK.
The 150mm product provides a thermal resistance of approximately 3.40m²K/W. The overall thermal performance of a completed roof or ceiling construction will depend on the full build-up, insulation depth, joists and other construction materials.
Euroclass A1 Non-Combustible Insulation
Knauf Loft Roll 44 achieves a Euroclass A1 reaction to fire classification in accordance with EN 13501-1.
A1 is the highest reaction-to-fire classification and means the glass mineral wool insulation is classified as non-combustible.
Glass Mineral Wool with ECOSE® Technology
Knauf Loft Roll 44 is manufactured from glass mineral wool using Knauf Insulation's ECOSE® Technology.
ECOSE® Technology uses Knauf's plant-based binder technology and forms part of its current glass mineral wool insulation range.
Installing Between Loft Joists
The Combi-Cut format makes the insulation particularly convenient for fitting between suitable ceiling joists. The roll can be separated into 570mm or 380mm widths to suit the layout of the roof construction where those dimensions are appropriate.
The insulation should be fitted closely between joists without unnecessary gaps and without compressing the mineral wool, as compression can affect its thermal performance.
Cross-Laying Loft Insulation
The 150mm roll can also be used as an additional insulation layer across an existing or base layer where required by the project specification.
Cross-laying insulation over the joists can help reduce thermal bridging through the timber and increase the overall insulation depth.
The total insulation build-up required will depend on the building design, existing insulation and applicable project or Building Regulations requirements, so the appropriate overall depth should always be confirmed for the individual project.
Suitable for New Insulation & Loft Upgrades
Knauf 150mm Loft Roll 44 can be used for both new insulation installations and loft insulation upgrades where the product thickness and thermal performance meet the required specification.
Typical applications include:
- Cold loft insulation
- Pitched roofs insulated at ceiling level
- Insulation between ceiling joists
- Cross-laid insulation over joists
- Topping up existing loft insulation
- New-build and refurbishment projects
- House extension roof insulation where specified
Loft Ventilation & Installation Considerations
When installing loft insulation, care should be taken not to obstruct required roof ventilation openings at the eaves or other ventilation points.
Any electrical cables, recessed lighting, water tanks, pipework and other services within the loft should be considered before installation and treated in accordance with the relevant manufacturer's and project requirements.
Always follow Knauf Insulation's current installation guidance and the requirements of the individual roof construction.
Handling Glass Mineral Wool Insulation
Wear suitable protective clothing and personal protective equipment when cutting and installing mineral wool insulation. Appropriate gloves, eye protection and respiratory protection should be used where required.
A suitable sharp insulation knife or utility knife and straight edge can help achieve clean cuts where additional trimming is necessary.
Why Choose Knauf 150mm Loft Roll 44 Combi-Cut?
Knauf 150mm Loft Roll 44 Combi-Cut provides an effective and flexible insulation solution for cold lofts and pitched roofs at ceiling level. Its 0.044 W/mK thermal conductivity, 3.40m²K/W thermal resistance and Euroclass A1 non-combustible fire performance provide clearly defined technical performance for residential insulation projects.
The partially perforated Combi-Cut design makes installation easier by allowing the full 1140mm roll to be split into either 570mm or 380mm widths, while each roll provides approximately 9.18m² of coverage.
