Full-Fill Cavity Insulation

ROCKWOOL® Cavity insulation is a rigid full-fill insulation solution for masonry cavity wall construction, suitable for use in new builds or extensions. Lightweight and easy to handle, the batts are simple to install and provide a close fit against brick and blockwork, adapting to imperfections in the cavity wall. ROCKWOOL® Cavity wall insulation is available in a range of thicknesses.


  • BBA certified for all exposure zones
  • Outstanding thermal and fire insulation
  • Does not require TCBs
  • Prevents water transmission from the outer to inner leaf
  • Non-combustible (Euroclass A1)
  • Superior fit against blockwork
  • No sagging or slumping

Technical information


455mm x 1200mm

50mm - 170mm
Thermal Conductivity0.037 W/mK
Fire Properties

Euroclass A1
Water RepellencyWater Repellent
Vapour ResistivityNegligable
EnvironmentalZero ODP & GWP
CertificationBS EN 13162, ISO 14001: 2004
StandardsBBA 94/3079 // KeyMark LPCB 022e // Kitemark KM06661