Knauf 100mm OmniFit Roll 40 Combi-Cut Glass Mineral Wool Insulation 8.16m²
Knauf 100mm OmniFit Roll 40 Combi-Cut is a multi-purpose glass mineral wool insulation roll designed to provide both thermal and acoustic performance across a range of building applications. Suitable for internal walls and partitions, internal and ground floors and pitched roofs insulated at ceiling level, OmniFit Roll 40 offers a flexible solution for both timber and steel frame construction.
Each 100mm roll covers approximately 8.16m² and provides a declared thermal conductivity of 0.040 W/mK with a thermal resistance of 2.50m²K/W. The insulation is non-combustible with a Euroclass A1 reaction-to-fire classification and is manufactured using Knauf Insulation's ECOSE® Technology.
Key Features & Benefits - Knauf 100mm OmniFit Roll 40
- Manufacturer: Knauf Insulation
- Range: OmniFit® Roll 40
- Product format: Combi-Cut insulation roll
- Material: Glass Mineral Wool
- Thickness: 100mm
- Roll dimensions: 6800x1200x100mm
- Coverage: approximately 8.16m² per roll
- Combi-Cut widths: 2x600mm or 3x400mm
- Thermal conductivity: 0.040 W/mK
- Thermal resistance: 2.50m²K/W
- Reaction to fire: Euroclass A1 - non-combustible
- Facing: Unfaced
- Performance: Thermal and acoustic insulation
- Applications: Internal walls, partitions, internal floors, ground floors and pitched roofs at ceiling level
- Frame applications: Suitable for timber and steel frame construction
- Technology: Manufactured using ECOSE® Technology
- Manufacturer product code: 474381
- EAN / GTIN: 5012061913453
Multi-Purpose Thermal & Acoustic Insulation
Unlike insulation rolls designed primarily for one application, Knauf OmniFit Roll 40 is a multi-purpose product that can be used across several areas of a building.
It combines thermal insulation with sound absorption performance, helping reduce heat transfer while also contributing to the acoustic performance of suitable wall, floor and roof constructions.
This multi-application design can help simplify product selection where the same type of glass mineral wool insulation is required across different parts of a project.
Suitable Applications
Knauf specifies OmniFit Roll 40 for a range of applications including:
- Internal walls and partitions
- Internal floors
- Ground floors
- Pitched roofs insulated at ceiling level
- Timber frame construction
- Steel frame construction
The suitability and required insulation thickness should always be confirmed against the specification and complete construction build-up for the individual project.
100mm Glass Mineral Wool Insulation
At 100mm thick, OmniFit Roll 40 provides a practical mineral wool insulation option for wall, floor and roof constructions where this thickness meets the project specification.
Glass mineral wool is flexible, allowing it to friction fit closely between suitable framing members and helping minimise gaps around the insulation that could otherwise reduce thermal performance.
8.16m² Coverage Per Roll
Each 100mm OmniFit Roll 40 provides approximately 8.16m² of coverage.
The complete roll measures approximately 6.8m long x 1.2m wide x 100mm thick before being separated along the Combi-Cut perforations.
Always allow for the dimensions and layout of the construction as well as suitable cutting and installation wastage when calculating the quantity required.
What Does Combi-Cut Mean?
Knauf OmniFit Roll 40 is supplied in a partially perforated Combi-Cut format designed for flexible installation within framed constructions.
The 1200mm overall width can be divided into:
- 2x600mm widths
- 3x400mm widths
This makes the roll particularly convenient for timber and steel frame applications at common 400mm or 600mm centres where the construction and clear opening are suitable.
Designed to Friction Fit Between Framing
OmniFit Roll 40 is designed to friction fit between studs and other suitable framing members.
A close friction fit helps reduce air movement and unwanted gaps around the edges of the insulation, supporting effective thermal performance across the completed construction.
Always measure the actual framing openings before installation and avoid excessive compression of the mineral wool.
Thermal Performance - 0.040 W/mK
Knauf OmniFit Roll 40 has a declared thermal conductivity of 0.040 W/mK.
At 100mm thickness, the product provides a thermal resistance of approximately 2.50m²K/W.
The final U-value or thermal performance of a wall, floor or roof will depend on the complete construction build-up rather than the insulation layer alone.
Acoustic Performance
In addition to thermal insulation, the glass mineral wool construction provides sound absorption and reduction properties, making OmniFit suitable for applications where both thermal and acoustic performance are required.
This can be particularly useful within internal partitions and intermediate floor constructions where reducing sound transmission between rooms or storeys forms part of the project design.
Overall acoustic performance will depend on the complete tested wall or floor system, including the framing, lining boards, fixings and insulation.
Internal Wall & Partition Insulation
OmniFit Roll 40 can be installed between suitable timber or steel studs within internal wall and partition constructions.
The flexible mineral wool helps fit closely within the framing while providing both thermal and acoustic benefits.
The finished performance of the partition will depend on the complete wall system, including stud depth, plasterboard specification and installation details.
Internal Floor Insulation
Knauf OmniFit Roll 40 is also suitable for internal floor applications where mineral wool insulation is required between suitable joists.
Its sound absorption properties can contribute to the acoustic performance of intermediate floor constructions while the flexible roll format enables it to fit between timber members.
Ground Floor Applications
Knauf also identifies OmniFit Roll 40 for suitable ground floor constructions.
The exact method of installation and overall floor build-up should follow the project specification and current Knauf technical guidance, including appropriate support and moisture control requirements.
Pitched Roofs at Ceiling Level
OmniFit Roll 40 can also be used in pitched roof constructions insulated at ceiling level where a 100mm multi-purpose insulation roll is appropriate for the specified build-up.
Where the main requirement is straightforward cold-loft insulation, Knauf Loft Roll 44 may also be worth considering as it is specifically designed for that application.
Euroclass A1 Non-Combustible Insulation
Knauf OmniFit Roll 40 achieves a Euroclass A1 reaction-to-fire classification under EN 13501-1.
A1 is the highest reaction-to-fire classification and means the glass mineral wool product is classified as non-combustible.
Manufactured with ECOSE® Technology
OmniFit Roll 40 is manufactured using Knauf Insulation's ECOSE® Technology, its plant-based binder technology used within the company's glass mineral wool products.
This forms part of Knauf Insulation's current mineral wool manufacturing technology and provides the distinctive natural brown appearance associated with ECOSE® glass mineral wool.
Unfaced Insulation Roll
Knauf OmniFit Roll 40 is supplied unfaced, allowing it to be incorporated into a range of suitable wall, floor and roof construction systems.
Any vapour control layer, membrane or lining required by the building design should be specified separately as part of the complete construction.
Installation Considerations
The insulation should be fitted closely between framing members without unnecessary gaps, while avoiding excessive compression of the mineral wool.
Services, electrical cables, ventilation requirements, moisture control layers and other building components should be considered before installation.
Always follow Knauf Insulation's current installation guidance, project drawings and the requirements of the complete wall, floor or roof system.
Handling Glass Mineral Wool Insulation
Use appropriate protective clothing and personal protective equipment when handling and cutting mineral wool insulation. Suitable gloves, eye protection and respiratory protection should be worn where required.
A sharp insulation knife or utility knife and straight edge can be used where additional cutting is necessary.
Why Choose Knauf 100mm OmniFit Roll 40?
Knauf 100mm OmniFit Roll 40 is a versatile insulation solution for projects requiring both thermal and acoustic performance. Its multi-purpose design allows it to be used across internal walls, floors and pitched roofs, reducing the need to select separate mineral wool products for every application.
With 8.16m² coverage per roll, 0.040 W/mK thermal conductivity, 2.50m²K/W thermal resistance and Euroclass A1 non-combustible fire performance, it provides clearly defined technical performance alongside a practical Combi-Cut format for timber and steel frame construction.
