Delivering over 30 years of proven performance, 75mm Rockwool Full Fill Cavity Batt Insulation stands as the go-to solution for cavity wall insulation across residential and commercial developments, from new builds to extensions. This premium 75mm stone wool insulation delivers superior thermal performance whilst actively resisting moisture penetration.
The 75mm Rockwool Full Fill Cavity Batt provides a reliable, economical solution for new masonry cavity walls. Approved by the BBA under full fill cavity wall insulation standards, it substantially reduces thermal transmittance (U value) across new external cavity walls with masonry construction on both sides.
The lightweight construction enables straightforward installation and positioning. It beds perfectly against brick and blockwork surfaces, easily accommodating minor cavity irregularities without compromise.
75mm ROCKWOOL Full Fill insulation naturally repels water, mirroring the stone-based composition from which it originates. It withstands moisture in damp conditions, safeguarding building integrity and occupant wellbeing over the long term.
Protecting cavities is essential for defending against severe weather exposure. Water damage compromises insulation effectiveness, yet 75mm Full Fill Cavity Batts deliver an outstanding, water-resistant option for new construction, cavity wall insulation and extension projects.
75mm Rockwool Full Fill cavity wall insulation works effectively for thermal insulation in external masonry cavity walls and delivers thermal insulation alongside acoustic benefits in masonry party walls separating residential units.
Approved by the British Board of Agrément (BBA) under Certificate 94/3079, 75mm rockwool Full Fill Cavity gains certification for deployment across all exposure zones in both domestic and non-domestic structures up to 25m height.
The NHBC (National House Building Council) confirms the appropriateness of 75mm Rockwool Cavity Batt for most situations, with the exception of highly exposed locations featuring fair-faced masonry finishes. Installation, application, and upkeep must comply with the specifications detailed in the BBA Certificate, in accordance with NHBC Standards, Chapter 6.1, External Masonry Walls.
The random fibre structure and mass of stone wool effectively capture sound energy and reduce vibration transmission, delivering substantial noise reduction from external sources when integrated into external walls.
75mm Rockwool Full Fill insulation preserves its dimensional stability and thickness throughout the building's lifespan, guaranteeing reliable acoustic performance year after year.








