How and where to use guide
EARTHWOOL LOFT ROLL 44 - 100mm (13.885m2) Combi Cut Glass Mineral Wool
Typical applications and where to use
Earthwool Loft Roll 44 is suitable for insulating domestic loft spaces, particularly where you need to achieve 100mm depth of coverage between or over timber joists. The combi-cut format works well in lofts with standard joist spacing, as the pre-cut widths align with common UK joist centres whilst the uncut length allows you to cut rolls to fit your exact loft dimensions. This product is an effective solution for cold lofts where there is adequate headroom and no restrictions on insulation thickness. It is not suitable for warm roof spaces, rafter insulation, or applications requiring vapour control layers as part of a sealed system.
- Domestic loft spaces with unrestricted headroom
- Cold loft insulation between or over timber joists
- New build and retrofit loft insulation projects
- Lofts with standard joist spacing and accessible layouts
Installation and on-site usage
The combi-cut format is designed for quick and simple installation. Unroll the product across your loft space, positioning it between joists or laying it over existing joists depending on your loft structure. The pre-cut widths mean minimal trimming is required for standard joist spacings. For non-standard dimensions, use a sharp utility knife to cut the uncut length sections to fit your specific loft measurements. Ensure the product sits flat and level without compression, as crushing the fibres reduces insulation performance. Work methodically across the loft, butting rolls edge-to-edge to avoid gaps. Wear appropriate personal protective equipment including gloves, long sleeves, and a dust mask when handling and cutting the material.
- Unroll across loft space, positioning between or over joists
- Use pre-cut widths for standard joist spacing to minimise trimming
- Cut uncut lengths with a sharp knife to fit exact loft dimensions
- Lay flat without compression for optimal thermal performance
- Butt rolls edge-to-edge to prevent thermal bridging
- Wear gloves, long sleeves, and dust mask during installation
Product specifications and coverage
This roll provides 13.885 square metres of coverage at 100mm thickness. The combi-cut format combines pre-cut widths with uncut lengths, offering flexibility for different loft layouts. The product holds a CCPI Verification Mark (certificate number 000600173/0627) for the entire product set, confirming compliance with relevant UK building standards and performance requirements. The 100mm thickness is suitable for lofts where headroom is not a constraint and provides effective thermal resistance for cold loft applications.
- Coverage: 13.885m2 per roll
- Thickness: 100mm
- Format: Combi-cut (pre-cut widths with uncut lengths)
- CCPI Verified product (certificate 000600173/0627)
Maintenance and site storage
Store rolls in a dry location before installation to prevent moisture absorption, which can compromise performance. Keep packaging intact until ready to install. Once installed in a cold loft, the product requires no ongoing maintenance. Ensure adequate ventilation in your loft space to prevent condensation build-up, which is essential for the longevity of both the insulation and timber structure. Do not compress or overload the installed insulation, as this will reduce its effectiveness. If you need to access the loft after installation, use proper loft boards or walkways to distribute your weight and avoid damaging the insulation layer.
- Store in dry conditions before installation
- Maintain loft ventilation to prevent condensation
- Avoid compressing installed insulation
- Use loft boards or walkways for safe access after installation