How and where to use guide
EARTHWOOL LOFT ROLL 44 - 150mm (9.177m2) Combi Cut Glass Mineral Wool
Typical applications
EARTHWOOL LOFT ROLL 44 is suitable for insulating cold loft spaces in domestic properties where the joist depth and available space allow for 150mm insulation thickness. It performs well in standard pitched roof lofts, flat roof voids, and between timber joists. The product is particularly effective where you need to cover large areas quickly without complex cutting or fitting around obstacles.
- Cold loft insulation between timber joists
- New build and renovation loft projects
- Spaces with unrestricted headroom and depth
- Areas requiring consistent 150mm thickness coverage
Installation and handling
The combi-cut format arrives pre-cut to simplify fitting between standard joist spacings. Unroll the product carefully across your loft space, ensuring it sits flush between joists without compression or gaps. The long roll length minimises the number of joins needed, speeding up installation. Always wear appropriate protective equipment including gloves, dust mask, and eye protection when handling mineral wool. Ensure adequate ventilation in the loft space during and after installation. Work methodically across the loft, pressing the insulation gently into place without crushing the material, as compression reduces thermal effectiveness.
- Wear gloves, mask, and eye protection during installation
- Unroll carefully to avoid tearing or compression
- Fit between joists with no gaps or overlaps
- Maintain loft ventilation to prevent condensation
- Use long roll lengths to minimise joins and installation time
Coverage and performance
This pack provides 9.177 square metres of coverage at 150mm thickness. The product holds CCPI Verification Mark certification (certificate number 000600173/0627) across the entire EARTHWOOL product range, confirming its thermal and fire performance credentials. Ensure you calculate your loft area accurately before ordering to avoid shortfalls. The 150mm thickness is fixed with this product; if your joists are shallower, you may need a thinner roll option instead.
- Coverage: 9.177m2 per roll at 150mm thickness
- CCPI Verified for thermal and fire performance
- Suitable only for spaces accommodating 150mm depth
- Calculate total loft area before ordering
Maintenance and limitations
Mineral wool insulation requires no ongoing maintenance once installed. However, ensure it remains dry and undisturbed; water damage or compression will reduce performance. Do not use in warm roof applications or where it will be exposed to direct moisture. Avoid walking directly on the insulation; use boards or duckboards if you need to access the loft space after installation. The product is not suitable for lofts with restricted headroom or where 150mm thickness cannot be accommodated.
- Keep dry and protected from water ingress
- Use duckboards to protect from foot traffic
- Not suitable for warm roof or exposed applications
- Do not compress or disturb after installation
- Unsuitable for spaces with restricted depth