For more than three decades, 100mm Rockwool Full Fill Cavity Batt Insulation has been a trusted choice for insulating cavity walls in both residential and commercial projects, whether they're new constructions or extensions. This 100mm stone wool insulation ensures lasting insulation by preventing moisture transfer.
The 100mm Rockwool Full Fill Cavity Batt presents a dependable and cost-efficient approach to insulating new masonry cavity walls. Certified by the BBA for full fill cavity wall insulation, it significantly lowers the thermal transmittance (U value) of new external cavity walls with masonry inner and outer leaves.
Its lightweight design makes handling a breeze, facilitating efficient installation. Plus, it snugly fits against brick and blockwork, effortlessly accommodating any imperfections in the cavity wall.
100mm ROCKWOOL Full Fill insulation resists water by nature, just like the stone from which it´s made. It also resists moisture in humid climates, protecting the longterm health of buildings and the people within them.
Insulating cavities is crucial for shielding against harsh weather conditions. Moisture-induced damage can undermine insulation effectiveness, but 100mm Full Fill Cavity Batts offer an excellent, water-resistant solution for both new construction, cavity wall insulation and extension endeavors.
100mm Rockwool Full Fill cavity wall insulation is suitable for thermal insulation in external masonry cavity walls and for providing thermal insulation and acoustic protection in masonry party walls between dwellings.
Certified by the British Board of Agrément (BBA) under Certificate 94/3079, 100mm rockwool Full Fill Cavity is approved for use in all exposure zones for both domestic and non-domestic buildings up to 25m in height.
The NHBC (National House Building Council) acknowledges the suitability of 100mm Rockwool Cavity Batt for most applications, except in highly exposed areas with fair-faced masonry. It must be installed, utilized, and maintained according to the guidelines outlined in the BBA Certificate, as per NHBC Standards, Chapter 6.1, External Masonry Walls.
The non-directional fiber orientation and density of stone wool effectively trap sound waves and dampen vibrations, leading to a notable reduction in external noise sources when incorporated into external walls.
100mm Rockwool Full Fill insulation maintains its shape and thickness throughout the lifespan of the building, ensuring consistent acoustic performance decade after decade.









